Remove install script, building from source is now opt-in

The vast majority of people don't need this. Package managers
are (correctly) starting to block install scripts by default,
so this change should reduce install-time warnings.

.cirrus.yml

@@ -1,5 +1,5 @@
 freebsd_instance:
-  image_family: freebsd-15-0
+  image_family: freebsd-16-0-snap
 
 task:
   name: FreeBSD

.github/ISSUE_TEMPLATE/installation.md

@@ -31,7 +31,7 @@ please open an issue against that package instead.
 
 <!-- Please place an [x] in the relevant box to confirm. -->
 
-- [ ] I am using Node.js with a version that satisfies `^18.17.0 || ^20.3.0 || >=21.0.0`
+- [ ] I am using Node.js with a version that satisfies `>=20.9.0`
 - [ ] I am using Deno
 - [ ] I am using Bun
 

.github/workflows/ci.yml

@@ -9,8 +9,8 @@ jobs:
       contents: read
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: "24"
       - run: npm install --ignore-scripts
@@ -31,123 +31,129 @@ jobs:
           - os: ubuntu-24.04
             container: rockylinux:8
             nodejs_arch: x64
-            nodejs_version: "^18.17.0"
+            nodejs_version: "^20.9.0"
-            nodejs_version_major: 18
+            nodejs_version_major: 20
             platform: linux-x64
             package: true
           - os: ubuntu-24.04
             container: rockylinux:8
             nodejs_arch: x64
-            nodejs_version: "^20.3.0"
+            nodejs_version: "^22"
-            nodejs_version_major: 20
-            platform: linux-x64
-          - os: ubuntu-24.04
-            container: rockylinux:8
-            nodejs_arch: x64
-            nodejs_version: "^22.9.0"
             nodejs_version_major: 22
             platform: linux-x64
           - os: ubuntu-24.04
-            container: node:18-alpine3.17
+            container: rockylinux:8
-            nodejs_version_major: 18
+            nodejs_arch: x64
-            platform: linuxmusl-x64
+            nodejs_version: "^24"
-            package: true
+            nodejs_version_major: 24
+            platform: linux-x64
           - os: ubuntu-24.04
             container: node:20-alpine3.18
             nodejs_version_major: 20
             platform: linuxmusl-x64
+            package: true
           - os: ubuntu-24.04
             container: node:22-alpine3.20
             nodejs_version_major: 22
             platform: linuxmusl-x64
+          - os: ubuntu-24.04
+            container: node:24-alpine3.22
+            nodejs_version_major: 24
+            platform: linuxmusl-x64
           - os: ubuntu-24.04-arm
             container: arm64v8/rockylinux:8
             nodejs_arch: arm64
-            nodejs_version: "^18.17.0"
+            nodejs_version: "^20.9.0"
-            nodejs_version_major: 18
+            nodejs_version_major: 20
             platform: linux-arm64
             package: true
           - os: ubuntu-24.04-arm
             container: arm64v8/rockylinux:8
             nodejs_arch: arm64
-            nodejs_version: "^20.3.0"
+            nodejs_version: "^22"
-            nodejs_version_major: 20
+            nodejs_version_major: 22
+            platform: linux-arm64
+          - os: ubuntu-24.04-arm
+            container: arm64v8/rockylinux:8
+            nodejs_arch: arm64
+            nodejs_version: "^24"
+            nodejs_version_major: 24
             platform: linux-arm64
           - os: macos-15-intel
             nodejs_arch: x64
-            nodejs_version: "^18.17.0"
+            nodejs_version: "^20.9.0"
-            nodejs_version_major: 18
+            nodejs_version_major: 20
             platform: darwin-x64
             package: true
           - os: macos-15-intel
             nodejs_arch: x64
-            nodejs_version: "^20.3.0"
+            nodejs_version: "^22"
-            nodejs_version_major: 20
+            nodejs_version_major: 22
             platform: darwin-x64
           - os: macos-15-intel
             nodejs_arch: x64
-            nodejs_version: "^22.9.0"
+            nodejs_version: "^24"
-            nodejs_version_major: 22
+            nodejs_version_major: 24
             platform: darwin-x64
           - os: macos-15
             nodejs_arch: arm64
-            nodejs_version: "^18.17.0"
+            nodejs_version: "^20.9.0"
-            nodejs_version_major: 18
+            nodejs_version_major: 20
             platform: darwin-arm64
             package: true
           - os: macos-15
             nodejs_arch: arm64
-            nodejs_version: "^20.3.0"
+            nodejs_version: "^22"
-            nodejs_version_major: 20
+            nodejs_version_major: 22
             platform: darwin-arm64
           - os: macos-15
             nodejs_arch: arm64
-            nodejs_version: "^22.9.0"
+            nodejs_version: "^24"
-            nodejs_version_major: 22
+            nodejs_version_major: 24
             platform: darwin-arm64
           - os: windows-2022
             nodejs_arch: x86
-            nodejs_version: "18.18.2" # pinned to avoid 18.19.0 and npm 10
+            nodejs_version: "^20.9.0"
-            nodejs_version_major: 18
+            nodejs_version_major: 20
             platform: win32-ia32
             package: true
           - os: windows-2022
             nodejs_arch: x86
-            nodejs_version: "^20.3.0"
+            nodejs_version: "^22"
-            nodejs_version_major: 20
-            platform: win32-ia32
-          - os: windows-2022
-            nodejs_arch: x86
-            nodejs_version: "^22.9.0"
             nodejs_version_major: 22
             platform: win32-ia32
           - os: windows-2022
             nodejs_arch: x64
-            nodejs_version: "^18.17.0"
+            nodejs_version: "^20.9.0"
-            nodejs_version_major: 18
+            nodejs_version_major: 20
             platform: win32-x64
             package: true
           - os: windows-2022
             nodejs_arch: x64
-            nodejs_version: "^20.3.0"
+            nodejs_version: "^22"
-            nodejs_version_major: 20
+            nodejs_version_major: 22
             platform: win32-x64
           - os: windows-2022
             nodejs_arch: x64
-            nodejs_version: "^22.9.0"
+            nodejs_version: "^24"
-            nodejs_version_major: 22
+            nodejs_version_major: 24
             platform: win32-x64
           - os: windows-11-arm
             nodejs_arch: arm64
-            nodejs_version: "^20.3.0"
+            nodejs_version: "^20.9.0"
             nodejs_version_major: 20
             platform: win32-arm64
             package: true
           - os: windows-11-arm
             nodejs_arch: arm64
-            nodejs_version: "^22.9.0"
+            nodejs_version: "^22"
             nodejs_version_major: 22
             platform: win32-arm64
+          - os: windows-11-arm
+            nodejs_arch: arm64
+            nodejs_version: "^24"
+            nodejs_version_major: 24
+            platform: win32-arm64
     steps:
       - name: Dependencies (Rocky Linux glibc)
         if: contains(matrix.container, 'rockylinux')
@@ -159,22 +165,22 @@ jobs:
         run: apk add build-base git python3 font-noto --update-cache
       - name: Dependencies (Python 3.11 - macOS, Windows)
         if: contains(matrix.os, 'macos') || contains(matrix.os, 'windows')
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - name: Dependencies (Node.js)
         if: "!contains(matrix.platform, 'linuxmusl')"
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.nodejs_version }}
           architecture: ${{ matrix.nodejs_arch }}
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: npm install
       - run: npm run build
       - run: npm run test-unit
       - if: matrix.package
         run: npm run package-from-local-build
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         if: matrix.package
         with:
           name: ${{ matrix.platform }}
@@ -191,16 +197,18 @@ jobs:
       image: ${{ matrix.container }}
       volumes:
         - /opt:/opt:rw,rshared
-        - /opt:/__e/node20:ro,rshared
+        - /opt:/__e/node24:ro,rshared
     strategy:
       fail-fast: false
       matrix:
         include:
-        - container: node:18-alpine3.17
+        - container: node:20-alpine3.20
-          nodejs_version_major: 18
-          package: true
-        - container: node:20-alpine3.18
           nodejs_version_major: 20
+          package: true
+        - container: node:22-alpine3.20
+          nodejs_version_major: 22
+        - container: node:24-alpine3.22
+          nodejs_version_major: 24
     steps:
       - name: Allow Linux musl containers on ARM64 runners # https://github.com/actions/runner/issues/801#issuecomment-2394425757
         shell: sh
@@ -211,13 +219,13 @@ jobs:
           ln -s /usr/bin/node /opt/bin/node
       - name: Dependencies
         run: apk add build-base git python3 font-noto --update-cache
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: npm install
       - run: npm run build
       - run: npm run test-unit
       - if: matrix.package
         run: npm run package-from-local-build
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         if: matrix.package
         with:
           name: linuxmusl-arm64
@@ -238,20 +246,20 @@ jobs:
             base_image: "balenalib/rpi-raspbian:bullseye"
             nodejs_arch: armv6l
             nodejs_hostname: unofficial-builds.nodejs.org
-            nodejs_version: "18.17.0"
+            nodejs_version: "20.9.0"
-            nodejs_version_major: 18
+            nodejs_version_major: 20
           - platform: linux-s390x
             base_image: "--platform=linux/s390x s390x/debian:bookworm"
             nodejs_arch: s390x
             nodejs_hostname: nodejs.org
-            nodejs_version: "18.17.0"
+            nodejs_version: "20.9.0"
-            nodejs_version_major: 18
+            nodejs_version_major: 20
           - platform: linux-ppc64
             base_image: "--platform=linux/ppc64le ppc64le/debian:bookworm"
             nodejs_arch: ppc64le
             nodejs_hostname: nodejs.org
-            nodejs_version: "18.17.0"
+            nodejs_version: "20.9.0"
-            nodejs_version_major: 18
+            nodejs_version_major: 20
           - platform: linux-riscv64
             base_image: "--platform=linux/riscv64 riscv64/debian:trixie"
             compiler_flags: "-march=rv64gc"
@@ -260,7 +268,7 @@ jobs:
             nodejs_version: "20.19.5"
             nodejs_version_major: 20
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: uraimo/run-on-arch-action@v3
         with:
           arch: none
@@ -279,7 +287,7 @@ jobs:
             npm run build
             node --test test/unit/io.js
             npm run package-from-local-build
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         with:
           name: ${{ matrix.platform }}
           path: npm/${{ matrix.platform }}
@@ -291,7 +299,7 @@ jobs:
     needs: lint
     name: "build-wasm32 [package]"
     runs-on: ubuntu-24.04
-    container: "emscripten/emsdk:4.0.18"
+    container: "emscripten/emsdk:4.0.21"
     steps:
       - uses: actions/checkout@v4
       - name: Dependencies
@@ -311,7 +319,7 @@ jobs:
           test "$EMSCRIPTEN_VERSION_LIBVIPS" = "$EMSCRIPTEN_VERSION_SHARP"
       - run: emmake npm run test-unit
       - run: emmake npm run package-from-local-build
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         with:
           name: wasm32
           path: npm/wasm32
@@ -329,12 +337,12 @@ jobs:
       - build-emscripten
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v7
         with:
           path: npm
       - name: Create npm workspace tarball
         run: tar -vcaf npm-workspace.tar.xz --directory npm --exclude=from-local-build.js .
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: '24'
       - name: Create release notes

.github/workflows/npm.yml

@@ -96,7 +96,7 @@ jobs:
     steps:
       - name: Install Node.js
         if: ${{ matrix.runtime == 'node' }}
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 20
       - name: Install pnpm

.gitignore

@@ -1,7 +1,6 @@
 src/build
 src/node_modules
 node_modules
-/coverage
 npm/*/*
 !npm/*/package.json
 test/bench/node_modules
@@ -9,7 +8,6 @@ test/fixtures/output*
 test/fixtures/vips-properties.xml
 test/leak/libvips.supp
 .DS_Store
-.nyc_output
 .vscode/
 package-lock.json
 .idea

README.md

@@ -8,7 +8,7 @@ smaller, web-friendly JPEG, PNG, WebP, GIF and AVIF images of varying dimensions
 
 It can be used with all JavaScript runtimes
 that provide support for Node-API v9, including
-Node.js (^18.17.0 or >= 20.3.0), Deno and Bun.
+Node.js (>= 20.9.0), Deno and Bun.
 
 Resizing an image is typically 4x-5x faster than using the
 quickest ImageMagick and GraphicsMagick settings

biome.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/2.3.4/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.3.10/schema.json",
   "vcs": {
     "enabled": true,
     "clientKind": "git",

docs/src/content/docs/api-input.md

@@ -17,7 +17,7 @@ Dimensions in the response will respect the `page` and `pages` properties of the
 
 A `Promise` is returned when `callback` is not provided.
 
-- `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
+- `format`: Name of decoder used to parse image e.g. `jpeg`, `png`, `webp`, `gif`, `svg`, `heif`, `tiff`
 - `size`: Total size of image in bytes, for Stream and Buffer input only
 - `width`: Number of pixels wide (EXIF orientation is not taken into consideration, see example below)
 - `height`: Number of pixels high (EXIF orientation is not taken into consideration, see example below)
@@ -50,6 +50,7 @@ A `Promise` is returned when `callback` is not provided.
 - `tifftagPhotoshop`: Buffer containing raw TIFFTAG_PHOTOSHOP data, if present
 - `formatMagick`: String containing format for images loaded via *magick
 - `comments`: Array of keyword/text pairs representing PNG text blocks, if present.
+- `gainMap.image`: HDR gain map, if present, as compressed JPEG image.
 
 
 

docs/src/content/docs/api-output.md

@@ -250,6 +250,27 @@ const outputWithP3 = await sharp(input)
 ```
 
 
+## withGainMap
+> withGainMap() ⇒ <code>Sharp</code>
+
+If the input contains gain map metadata, use it to convert the main image to HDR (High Dynamic Range) before further processing.
+The input gain map is discarded.
+
+If the output is JPEG, generate and attach a new ISO 21496-1 gain map.
+JPEG output options other than `quality` are ignored.
+
+This feature is experimental and the API may change.
+
+
+**Since**: 0.35.0  
+**Example**  
+```js
+const outputWithGainMap = await sharp(inputWithGainMap)
+  .withGainMap()
+  .toBuffer();
+```
+
+
 ## keepXmp
 > keepXmp() ⇒ <code>Sharp</code>
 

docs/src/content/docs/changelog/v0.35.0.md

@@ -0,0 +1,14 @@
+---
+title: v0.35.0 - TBC
+slug: changelog/v0.35.0
+---
+
+* Breaking: Drop support for Node.js 18, now requires Node.js >= 20.9.0.
+
+* Breaking: Remove `install` script from `package.json` file.
+  Compiling from source is now opt-in via the `build` script.
+
+* Upgrade to libvips v8.18.0 for upstream bug fixes.
+
+* Add `withGainMap` to process HDR JPEG images with embedded gain maps.
+  [#4314](https://github.com/lovell/sharp/issues/4314)

docs/src/content/docs/index.md

@@ -10,7 +10,7 @@ smaller, web-friendly JPEG, PNG, WebP, GIF and AVIF images of varying dimensions
 
 It can be used with all JavaScript runtimes
 that provide support for Node-API v9, including
-Node.js >= 18.17.0, Deno and Bun.
+Node.js >= 20.9.0, Deno and Bun.
 
 Resizing an image is typically 4x-5x faster than using the
 quickest ImageMagick and GraphicsMagick settings

docs/src/content/docs/install.md

@@ -20,10 +20,6 @@ npm install sharp
 pnpm add sharp
 ```
 
-When using `pnpm`, add `sharp` to
-[ignoredBuiltDependencies](https://pnpm.io/settings#ignoredbuiltdependencies)
-to silence warnings.
-
 ```sh frame="none"
 yarn add sharp
 ```
@@ -39,7 +35,7 @@ deno run --allow-env --allow-ffi --allow-read --allow-sys ...
 
 ## Prerequisites
 
-* Node-API v9 compatible runtime e.g. Node.js ^18.17.0 or >=20.3.0.
+* Node-API v9 compatible runtime e.g. Node.js >= 20.9.0.
 
 ## Prebuilt binaries
 
@@ -112,13 +108,13 @@ and on macOS when running Node.js under Rosetta.
 
 ## Building from source
 
-This module will be compiled from source when:
+```sh frame="none"
+npm install sharp
+npm explore sharp -- npm run build
+```
 
-* a globally-installed libvips is detected, or
+The build process will search for a globally-installed libvips.
-* using `npm explore sharp -- npm run build`, or
+This detection logic can be skipped by setting the
-* using the deprecated `npm run --build-from-source` at `npm install` time.
-
-The logic to detect a globally-installed libvips can be skipped by setting the
 `SHARP_IGNORE_GLOBAL_LIBVIPS` (never try to use it) or
 `SHARP_FORCE_GLOBAL_LIBVIPS` (always try to use it, even when missing or outdated)
 environment variables.
@@ -129,21 +125,12 @@ Building from source requires:
 * [node-addon-api](https://www.npmjs.com/package/node-addon-api) version 7+
 * [node-gyp](https://github.com/nodejs/node-gyp#installation) version 9+ and its dependencies
 
-There is an install-time check for these dependencies.
 If `node-addon-api` or `node-gyp` cannot be found, try adding them via:
 
 ```sh frame="none"
 npm install --save node-addon-api node-gyp
 ```
 
-When using `pnpm`, you may need to add `sharp` to
-[onlyBuiltDependencies](https://pnpm.io/settings#onlybuiltdependencies)
-to ensure the installation script can be run.
-
-For cross-compiling, the `--platform`, `--arch` and `--libc` npm flags
-(or the `npm_config_platform`, `npm_config_arch` and `npm_config_libc` environment variables)
-can be used to configure the target environment.
-
 ## WebAssembly
 
 Experimental support is provided for runtime environments that provide
@@ -166,10 +153,8 @@ as well as the additional [building from source](#building-from-source) dependen
 
 ```sh frame="none"
 pkg install -y pkgconf vips
-```
+npm install sharp
-
+npm explore sharp -- npm run build
-```sh frame="none"
-cd /usr/ports/graphics/vips/ && make install clean
 ```
 
 ## Linux memory allocator

install/build.js

@@ -10,7 +10,7 @@ const {
   spawnRebuild,
 } = require('../lib/libvips');
 
-log('Attempting to build from source via node-gyp');
+log('Building from source');
 log('See https://sharp.pixelplumbing.com/install#building-from-source');
 
 try {
@@ -29,7 +29,7 @@ try {
 }
 
 if (useGlobalLibvips(log)) {
-  log(`Detected globally-installed libvips v${globalLibvipsVersion()}`);
+  log(`Found globally-installed libvips v${globalLibvipsVersion()}`);
 }
 
 const status = spawnRebuild();

install/check.js

@@ -1,14 +0,0 @@
-/*!
-  Copyright 2013 Lovell Fuller and others.
-  SPDX-License-Identifier: Apache-2.0
-*/
-
-try {
-  const { useGlobalLibvips } = require('../lib/libvips');
-  if (useGlobalLibvips() || process.env.npm_config_build_from_source) {
-    process.exit(1);
-  }
-} catch (err) {
-  const summary = err.message.split(/\n/).slice(0, 1);
-  console.log(`sharp: skipping install check: ${summary}`);
-}

lib/constructor.js

@@ -313,6 +313,7 @@ const Sharp = function (input, options) {
     withExif: {},
     withExifMerge: true,
     withXmp: '',
+    withGainMap: false,
     resolveWithObject: false,
     loop: -1,
     delay: [],

lib/index.d.ts

@@ -1028,11 +1028,11 @@ declare namespace sharp {
         openSlide?: OpenSlideInputOptions | undefined;
         /** JPEG 2000 specific input options */
         jp2?: Jp2InputOptions | undefined;
-        /** Deprecated: use tiff.subifd instead */
+        /** @deprecated Use {@link SharpOptions.tiff} instead */
         subifd?: number | undefined;
-        /** Deprecated: use pdf.background instead */
+        /** @deprecated Use {@link SharpOptions.pdf} instead */
         pdfBackground?: Colour | Color | undefined;
-        /** Deprecated: use openSlide.level instead */
+        /** @deprecated Use {@link SharpOptions.openSlide} instead */
         level?: number | undefined;
         /** Set to `true` to read all frames/pages of an animated image (equivalent of setting `pages` to `-1`). (optional, default false) */
         animated?: boolean | undefined;
@@ -1277,6 +1277,8 @@ declare namespace sharp {
         formatMagick?: string | undefined;
         /** Array of keyword/text pairs representing PNG text blocks, if present. */
         comments?: CommentsMetadata[] | undefined;
+        /** HDR gain map, if present */
+        gainMap?: GainMapMetadata | undefined;
     }
 
     interface LevelMetadata {
@@ -1289,6 +1291,11 @@ declare namespace sharp {
         text: string;
     }
 
+    interface GainMapMetadata {
+        /** JPEG image */
+        image: Buffer;
+    }
+
     interface Stats {
         /** Array of channel statistics for each channel in the image. */
         channels: ChannelStats[];

lib/input.js

@@ -574,7 +574,7 @@ function _isStreamInput () {
  *
  * A `Promise` is returned when `callback` is not provided.
  *
- * - `format`: Name of decoder used to decompress image data e.g. `jpeg`, `png`, `webp`, `gif`, `svg`
+ * - `format`: Name of decoder used to parse image e.g. `jpeg`, `png`, `webp`, `gif`, `svg`, `heif`, `tiff`
  * - `size`: Total size of image in bytes, for Stream and Buffer input only
  * - `width`: Number of pixels wide (EXIF orientation is not taken into consideration, see example below)
  * - `height`: Number of pixels high (EXIF orientation is not taken into consideration, see example below)
@@ -607,6 +607,7 @@ function _isStreamInput () {
  * - `tifftagPhotoshop`: Buffer containing raw TIFFTAG_PHOTOSHOP data, if present
  * - `formatMagick`: String containing format for images loaded via *magick
  * - `comments`: Array of keyword/text pairs representing PNG text blocks, if present.
+ * - `gainMap.image`: HDR gain map, if present, as compressed JPEG image.
  *
  * @example
  * const metadata = await sharp(input).metadata();

lib/output.js

@@ -319,6 +319,30 @@ function withIccProfile (icc, options) {
   return this;
 }
 
+/**
+ * If the input contains gain map metadata, use it to convert the main image to HDR (High Dynamic Range) before further processing.
+ * The input gain map is discarded.
+ *
+ * If the output is JPEG, generate and attach a new ISO 21496-1 gain map.
+ * JPEG output options other than `quality` are ignored.
+ *
+ * This feature is experimental and the API may change.
+ *
+ * @since 0.35.0
+ *
+ * @example
+ * const outputWithGainMap = await sharp(inputWithGainMap)
+ *   .withGainMap()
+ *   .toBuffer();
+ *
+ * @returns {Sharp}
+ */
+function withGainMap() {
+  this.options.withGainMap = true;
+  this.options.colourspace = 'scrgb';
+  return this;
+}
+
 /**
  * Keep XMP metadata from the input image in the output image.
  *
@@ -1640,6 +1664,7 @@ module.exports = (Sharp) => {
     withExifMerge,
     keepIccProfile,
     withIccProfile,
+    withGainMap,
     keepXmp,
     withXmp,
     keepMetadata,

lib/sharp.js

@@ -7,12 +7,13 @@
 
 const { familySync, versionSync } = require('detect-libc');
 
+const { version } = require('../package.json');
 const { runtimePlatformArch, isUnsupportedNodeRuntime, prebuiltPlatforms, minimumLibvipsVersion } = require('./libvips');
 const runtimePlatform = runtimePlatformArch();
 
 const paths = [
-  `../src/build/Release/sharp-${runtimePlatform}.node`,
+  `../src/build/Release/sharp-${runtimePlatform}-${version}.node`,
-  '../src/build/Release/sharp-wasm32.node',
+  `../src/build/Release/sharp-wasm32-${version}.node`,
   `@img/sharp-${runtimePlatform}/sharp.node`,
   '@img/sharp-wasm32/sharp.node'
 ];
@@ -72,6 +73,7 @@ if (sharp) {
   } else {
     help.push(
       `- Manually install libvips >= ${minimumLibvipsVersion}`,
+      '    See https://sharp.pixelplumbing.com/install#building-from-source',
       '- Add experimental WebAssembly-based dependencies:',
       '    npm install --cpu=wasm32 sharp',
       '    npm install @img/sharp-wasm32'

npm/darwin-arm64/package.json

@@ -15,9 +15,10 @@
   },
   "preferUnplugged": true,
   "optionalDependencies": {
-    "@img/sharp-libvips-darwin-arm64": "1.2.4"
+    "@img/sharp-libvips-darwin-arm64": "1.3.0-rc.1"
   },
   "files": [
+    "index.cjs",
     "lib"
   ],
   "publishConfig": {
@@ -25,11 +26,11 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-darwin-arm64.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "os": [
     "darwin"

npm/darwin-x64/package.json

@@ -15,9 +15,10 @@
   },
   "preferUnplugged": true,
   "optionalDependencies": {
-    "@img/sharp-libvips-darwin-x64": "1.2.4"
+    "@img/sharp-libvips-darwin-x64": "1.3.0-rc.1"
   },
   "files": [
+    "index.cjs",
     "lib"
   ],
   "publishConfig": {
@@ -25,11 +26,11 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-darwin-x64.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "os": [
     "darwin"

npm/from-local-build.js

@@ -44,9 +44,10 @@ cpSync(releaseDir, libDir, {
   }
 });
 
-// Generate README
+// Generate README and index.cjs
-const { name, description } = require(`./${platform}/package.json`);
+const { version, name, description } = require(`./${platform}/package.json`);
 writeFileSync(join(destDir, 'README.md'), `# \`${name}\`\n\n${description}.\n${licensing}`);
+writeFileSync(join(destDir, 'index.cjs'), `module.exports = require('./lib/sharp-${platform}-${version}.node');`);
 
 // Copy Apache-2.0 LICENSE
 copyFileSync(join(__dirname, '..', 'LICENSE'), join(destDir, 'LICENSE'));

npm/linux-arm/package.json

@@ -15,9 +15,10 @@
   },
   "preferUnplugged": true,
   "optionalDependencies": {
-    "@img/sharp-libvips-linux-arm": "1.2.4"
+    "@img/sharp-libvips-linux-arm": "1.3.0-rc.1"
   },
   "files": [
+    "index.cjs",
     "lib"
   ],
   "publishConfig": {
@@ -25,11 +26,11 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-linux-arm.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "config": {
     "glibc": ">=2.31"

npm/linux-arm64/package.json

@@ -15,9 +15,10 @@
   },
   "preferUnplugged": true,
   "optionalDependencies": {
-    "@img/sharp-libvips-linux-arm64": "1.2.4"
+    "@img/sharp-libvips-linux-arm64": "1.3.0-rc.1"
   },
   "files": [
+    "index.cjs",
     "lib"
   ],
   "publishConfig": {
@@ -25,11 +26,11 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-linux-arm64.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "config": {
     "glibc": ">=2.26"

npm/linux-ppc64/package.json

@@ -15,9 +15,10 @@
   },
   "preferUnplugged": true,
   "optionalDependencies": {
-    "@img/sharp-libvips-linux-ppc64": "1.2.4"
+    "@img/sharp-libvips-linux-ppc64": "1.3.0-rc.1"
   },
   "files": [
+    "index.cjs",
     "lib"
   ],
   "publishConfig": {
@@ -25,11 +26,11 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-linux-ppc64.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "config": {
     "glibc": ">=2.36"

npm/linux-riscv64/package.json

@@ -15,9 +15,10 @@
   },
   "preferUnplugged": true,
   "optionalDependencies": {
-    "@img/sharp-libvips-linux-riscv64": "1.2.4"
+    "@img/sharp-libvips-linux-riscv64": "1.3.0-rc.1"
   },
   "files": [
+    "index.cjs",
     "lib"
   ],
   "publishConfig": {
@@ -25,11 +26,11 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-linux-riscv64.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "config": {
     "glibc": ">=2.41"

npm/linux-s390x/package.json

@@ -15,9 +15,10 @@
   },
   "preferUnplugged": true,
   "optionalDependencies": {
-    "@img/sharp-libvips-linux-s390x": "1.2.4"
+    "@img/sharp-libvips-linux-s390x": "1.3.0-rc.1"
   },
   "files": [
+    "index.cjs",
     "lib"
   ],
   "publishConfig": {
@@ -25,11 +26,11 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-linux-s390x.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "config": {
     "glibc": ">=2.36"

npm/linux-x64/package.json

@@ -15,9 +15,10 @@
   },
   "preferUnplugged": true,
   "optionalDependencies": {
-    "@img/sharp-libvips-linux-x64": "1.2.4"
+    "@img/sharp-libvips-linux-x64": "1.3.0-rc.1"
   },
   "files": [
+    "index.cjs",
     "lib"
   ],
   "publishConfig": {
@@ -25,11 +26,11 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-linux-x64.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "config": {
     "glibc": ">=2.26"

npm/linuxmusl-arm64/package.json

@@ -15,9 +15,10 @@
   },
   "preferUnplugged": true,
   "optionalDependencies": {
-    "@img/sharp-libvips-linuxmusl-arm64": "1.2.4"
+    "@img/sharp-libvips-linuxmusl-arm64": "1.3.0-rc.1"
   },
   "files": [
+    "index.cjs",
     "lib"
   ],
   "publishConfig": {
@@ -25,11 +26,11 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-linuxmusl-arm64.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "config": {
     "musl": ">=1.2.2"

npm/linuxmusl-x64/package.json

@@ -15,9 +15,10 @@
   },
   "preferUnplugged": true,
   "optionalDependencies": {
-    "@img/sharp-libvips-linuxmusl-x64": "1.2.4"
+    "@img/sharp-libvips-linuxmusl-x64": "1.3.0-rc.1"
   },
   "files": [
+    "index.cjs",
     "lib"
   ],
   "publishConfig": {
@@ -25,11 +26,11 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-linuxmusl-x64.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "config": {
     "musl": ">=1.2.2"

npm/wasm32/package.json

@@ -23,15 +23,15 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-wasm32.node.js",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json",
     "./versions": "./versions.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "dependencies": {
-    "@emnapi/runtime": "^1.7.0"
+    "@emnapi/runtime": "^1.7.1"
   },
   "cpu": [
     "wasm32"

npm/win32-arm64/package.json

@@ -15,6 +15,7 @@
   },
   "preferUnplugged": true,
   "files": [
+    "index.cjs",
     "lib",
     "versions.json"
   ],
@@ -23,12 +24,12 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-win32-arm64.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json",
     "./versions": "./versions.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "os": [
     "win32"

npm/win32-ia32/package.json

@@ -15,6 +15,7 @@
   },
   "preferUnplugged": true,
   "files": [
+    "index.cjs",
     "lib",
     "versions.json"
   ],
@@ -23,12 +24,12 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-win32-ia32.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json",
     "./versions": "./versions.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "os": [
     "win32"

npm/win32-x64/package.json

@@ -15,6 +15,7 @@
   },
   "preferUnplugged": true,
   "files": [
+    "index.cjs",
     "lib",
     "versions.json"
   ],
@@ -23,12 +24,12 @@
   },
   "type": "commonjs",
   "exports": {
-    "./sharp.node": "./lib/sharp-win32-x64.node",
+    "./sharp.node": "./index.cjs",
     "./package": "./package.json",
     "./versions": "./versions.json"
   },
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "os": [
     "win32"

package.json

@@ -93,8 +93,7 @@
   ],
   "scripts": {
     "build": "node install/build.js",
-    "install": "node install/check.js || npm run build",
+    "clean": "rm -rf src/build/ test/fixtures/output.*",
-    "clean": "rm -rf src/build/ .nyc_output/ coverage/ test/fixtures/output.*",
     "test": "npm run lint && npm run test-unit",
     "lint": "npm run lint-cpp && npm run lint-js && npm run lint-types",
     "lint-cpp": "cpplint --quiet src/*.h src/*.cc",
@@ -146,16 +145,16 @@
   "optionalDependencies": {
     "@img/sharp-darwin-arm64": "0.34.5",
     "@img/sharp-darwin-x64": "0.34.5",
-    "@img/sharp-libvips-darwin-arm64": "1.2.4",
+    "@img/sharp-libvips-darwin-arm64": "1.3.0-rc.1",
-    "@img/sharp-libvips-darwin-x64": "1.2.4",
+    "@img/sharp-libvips-darwin-x64": "1.3.0-rc.1",
-    "@img/sharp-libvips-linux-arm": "1.2.4",
+    "@img/sharp-libvips-linux-arm": "1.3.0-rc.1",
-    "@img/sharp-libvips-linux-arm64": "1.2.4",
+    "@img/sharp-libvips-linux-arm64": "1.3.0-rc.1",
-    "@img/sharp-libvips-linux-ppc64": "1.2.4",
+    "@img/sharp-libvips-linux-ppc64": "1.3.0-rc.1",
-    "@img/sharp-libvips-linux-riscv64": "1.2.4",
+    "@img/sharp-libvips-linux-riscv64": "1.3.0-rc.1",
-    "@img/sharp-libvips-linux-s390x": "1.2.4",
+    "@img/sharp-libvips-linux-s390x": "1.3.0-rc.1",
-    "@img/sharp-libvips-linux-x64": "1.2.4",
+    "@img/sharp-libvips-linux-x64": "1.3.0-rc.1",
-    "@img/sharp-libvips-linuxmusl-arm64": "1.2.4",
+    "@img/sharp-libvips-linuxmusl-arm64": "1.3.0-rc.1",
-    "@img/sharp-libvips-linuxmusl-x64": "1.2.4",
+    "@img/sharp-libvips-linuxmusl-x64": "1.3.0-rc.1",
     "@img/sharp-linux-arm": "0.34.5",
     "@img/sharp-linux-arm64": "0.34.5",
     "@img/sharp-linux-ppc64": "0.34.5",
@@ -170,31 +169,31 @@
     "@img/sharp-win32-x64": "0.34.5"
   },
   "devDependencies": {
-    "@biomejs/biome": "^2.3.4",
+    "@biomejs/biome": "^2.3.10",
     "@cpplint/cli": "^0.1.0",
-    "@emnapi/runtime": "^1.7.0",
+    "@emnapi/runtime": "^1.7.1",
-    "@img/sharp-libvips-dev": "1.2.4",
+    "@img/sharp-libvips-dev": "1.3.0-rc.1",
-    "@img/sharp-libvips-dev-wasm32": "1.2.4",
+    "@img/sharp-libvips-dev-wasm32": "1.3.0-rc.1",
-    "@img/sharp-libvips-win32-arm64": "1.2.4",
+    "@img/sharp-libvips-win32-arm64": "1.3.0-rc.1",
-    "@img/sharp-libvips-win32-ia32": "1.2.4",
+    "@img/sharp-libvips-win32-ia32": "1.3.0-rc.1",
-    "@img/sharp-libvips-win32-x64": "1.2.4",
+    "@img/sharp-libvips-win32-x64": "1.3.0-rc.1",
     "@types/node": "*",
-    "emnapi": "^1.7.0",
+    "emnapi": "^1.7.1",
-    "exif-reader": "^2.0.2",
+    "exif-reader": "^2.0.3",
     "extract-zip": "^2.0.1",
     "icc": "^3.0.0",
     "jsdoc-to-markdown": "^9.1.3",
     "node-addon-api": "^8.5.0",
-    "node-gyp": "^11.5.0",
+    "node-gyp": "^12.1.0",
     "tar-fs": "^3.1.1",
     "tsd": "^0.33.0"
   },
   "license": "Apache-2.0",
   "engines": {
-    "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+    "node": ">=20.9.0"
   },
   "config": {
-    "libvips": ">=8.17.3"
+    "libvips": ">=8.18.0"
   },
   "funding": {
     "url": "https://opencollective.com/libvips"

src/binding.gyp

@@ -5,6 +5,7 @@
   'variables': {
     'vips_version': '<!(node -p "require(\'../lib/libvips\').minimumLibvipsVersion")',
     'platform_and_arch': '<!(node -p "require(\'../lib/libvips\').buildPlatformArch()")',
+    'sharp_version': '<!(node -p "require(\'../package.json\').version")',
     'sharp_libvips_version': '<!(node -p "require(\'../package.json\').optionalDependencies[\'@img/sharp-libvips-<(platform_and_arch)\']")',
     'sharp_libvips_yarn_locator': '<!(node -p "require(\'../lib/libvips\').yarnLocator()")',
     'sharp_libvips_include_dir': '<!(node -p "require(\'../lib/libvips\').buildSharpLibvipsIncludeDir()")',
@@ -81,7 +82,7 @@
       }]
     ]
   }, {
-    'target_name': 'sharp-<(platform_and_arch)',
+    'target_name': 'sharp-<(platform_and_arch)-<(sharp_version)',
     'defines': [
       'G_DISABLE_ASSERT',
       'G_DISABLE_CAST_CHECKS',
@@ -120,7 +121,7 @@
     'conditions': [
       ['use_global_libvips == "true"', {
         # Use pkg-config for include and lib
-        'include_dirs': ['<!@(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --cflags-only-I vips-cpp vips glib-2.0 | sed s\/-I//g)'],
+        'include_dirs': ['<!@(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --cflags-only-I vips-cpp vips glib-2.0 | sed s/-I//g)'],
         'libraries': ['<!@(PKG_CONFIG_PATH="<(pkg_config_path)" pkg-config --libs vips-cpp)'],
         'defines': [
           'SHARP_USE_GLOBAL_LIBVIPS'
@@ -282,7 +283,7 @@
     'target_name': 'copy-dll',
     'type': 'none',
     'dependencies': [
-      'sharp-<(platform_and_arch)'
+      'sharp-<(platform_and_arch)-<(sharp_version)'
     ],
     'conditions': [
       ['OS == "win"', {

src/common.cc

@@ -289,6 +289,7 @@ namespace sharp {
       case ImageType::JXL: id = "jxl"; break;
       case ImageType::RAD: id = "rad"; break;
       case ImageType::DCRAW: id = "dcraw"; break;
+      case ImageType::UHDR: id = "uhdr"; break;
       case ImageType::VIPS: id = "vips"; break;
       case ImageType::RAW: id = "raw"; break;
       case ImageType::UNKNOWN: id = "unknown"; break;
@@ -339,6 +340,9 @@ namespace sharp {
     { "VipsForeignLoadRadBuffer", ImageType::RAD },
     { "VipsForeignLoadDcRawFile", ImageType::DCRAW },
     { "VipsForeignLoadDcRawBuffer", ImageType::DCRAW },
+    { "VipsForeignLoadUhdr", ImageType::UHDR },
+    { "VipsForeignLoadUhdrFile", ImageType::UHDR },
+    { "VipsForeignLoadUhdrBuffer", ImageType::UHDR },
     { "VipsForeignLoadVips", ImageType::VIPS },
     { "VipsForeignLoadVipsFile", ImageType::VIPS },
     { "VipsForeignLoadRaw", ImageType::RAW }
@@ -356,6 +360,9 @@ namespace sharp {
         imageType = it->second;
       }
     }
+    if (imageType == ImageType::UHDR) {
+      imageType = ImageType::JPEG;
+    }
     return imageType;
   }
 
@@ -375,6 +382,9 @@ namespace sharp {
         imageType = ImageType::MISSING;
       }
     }
+    if (imageType == ImageType::UHDR) {
+      imageType = ImageType::JPEG;
+    }
     return imageType;
   }
 
@@ -1127,4 +1137,20 @@ namespace sharp {
     }
     return image;
   }
+
+  /*
+    Does this image have a gain map?
+  */
+  bool HasGainMap(VImage image) {
+    return image.get_typeof("gainmap-data") == VIPS_TYPE_BLOB;
+  }
+
+  /*
+    Removes gain map, if any.
+  */
+  VImage RemoveGainMap(VImage image) {
+    VImage copy = image.copy();
+    copy.remove("gainmap-data");
+    return copy;
+  }
 }  // namespace sharp

src/common.h

@@ -18,9 +18,9 @@
 // Verify platform and compiler compatibility
 
 #if (VIPS_MAJOR_VERSION < 8) || \
-  (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 17) || \
+  (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION < 18) || \
-  (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION == 17 && VIPS_MICRO_VERSION < 3)
+  (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION == 18 && VIPS_MICRO_VERSION < 0)
-#error "libvips version 8.17.3+ is required - please see https://sharp.pixelplumbing.com/install"
+#error "libvips version 8.18.0+ is required - please see https://sharp.pixelplumbing.com/install"
 #endif
 
 #if defined(__has_include)
@@ -173,6 +173,7 @@ namespace sharp {
     JXL,
     RAD,
     DCRAW,
+    UHDR,
     VIPS,
     RAW,
     UNKNOWN,
@@ -397,6 +398,16 @@ namespace sharp {
   */
   VImage StaySequential(VImage image, bool condition = true);
 
+  /*
+    Does this image have a gain map?
+  */
+  bool HasGainMap(VImage image);
+
+  /*
+    Removes gain map, if any.
+  */
+  VImage RemoveGainMap(VImage image);
+
 }  // namespace sharp
 
 #endif  // SRC_COMMON_H_

src/metadata.cc

@@ -141,6 +141,14 @@ class MetadataWorker : public Napi::AsyncWorker {
         memcpy(baton->tifftagPhotoshop, tifftagPhotoshop, tifftagPhotoshopLength);
         baton->tifftagPhotoshopLength = tifftagPhotoshopLength;
       }
+      // Gain Map
+      if (image.get_typeof("gainmap-data") == VIPS_TYPE_BLOB) {
+        size_t gainMapLength;
+        void const *gainMap = image.get_blob("gainmap-data", &gainMapLength);
+        baton->gainMap = static_cast<char *>(g_malloc(gainMapLength));
+        memcpy(baton->gainMap, gainMap, gainMapLength);
+        baton->gainMapLength = gainMapLength;
+      }
       // PNG comments
       vips_image_map(image.get_image(), readPNGComment, &baton->comments);
     }
@@ -276,6 +284,12 @@ class MetadataWorker : public Napi::AsyncWorker {
           Napi::Buffer<char>::NewOrCopy(env, baton->tifftagPhotoshop,
             baton->tifftagPhotoshopLength, sharp::FreeCallback));
       }
+      if (baton->gainMapLength > 0) {
+        Napi::Object gainMap = Napi::Object::New(env);
+        info.Set("gainMap", gainMap);
+        gainMap.Set("image",
+          Napi::Buffer<char>::NewOrCopy(env, baton->gainMap, baton->gainMapLength, sharp::FreeCallback));
+      }
       if (baton->comments.size() > 0) {
         int i = 0;
         Napi::Array comments = Napi::Array::New(env, baton->comments.size());

src/metadata.h

@@ -53,6 +53,8 @@ struct MetadataBaton {
   size_t xmpLength;
   char *tifftagPhotoshop;
   size_t tifftagPhotoshopLength;
+  char *gainMap;
+  size_t gainMapLength;
   MetadataComments comments;
   std::string err;
 
@@ -82,7 +84,9 @@ struct MetadataBaton {
     xmp(nullptr),
     xmpLength(0),
     tifftagPhotoshop(nullptr),
-    tifftagPhotoshopLength(0) {}
+    tifftagPhotoshopLength(0),
+    gainMap(nullptr),
+    gainMapLength(0) {}
 };
 
 Napi::Value metadata(const Napi::CallbackInfo& info);

src/pipeline.cc

@@ -296,6 +296,14 @@ class PipelineWorker : public Napi::AsyncWorker {
       if (baton->input->autoOrient) {
         image = sharp::RemoveExifOrientation(image);
       }
+      if (sharp::HasGainMap(image)) {
+        if (baton->withGainMap) {
+          image = image.uhdr2scRGB();
+        }
+        image = sharp::RemoveGainMap(image);
+      } else {
+        baton->withGainMap = false;
+      }
 
       // Any pre-shrinking may already have been done
       inputWidth = image.width();
@@ -335,7 +343,7 @@ class PipelineWorker : public Napi::AsyncWorker {
         image.interpretation() != VIPS_INTERPRETATION_LABS &&
         image.interpretation() != VIPS_INTERPRETATION_GREY16 &&
         baton->colourspacePipeline != VIPS_INTERPRETATION_CMYK &&
-        !baton->input->ignoreIcc
+        !baton->input->ignoreIcc && !baton->withGainMap
       ) {
         // Convert to sRGB/P3 using embedded profile
         try {
@@ -1706,6 +1714,7 @@ Napi::Value pipeline(const Napi::CallbackInfo& info) {
   }
   baton->withExifMerge = sharp::AttrAsBool(options, "withExifMerge");
   baton->withXmp = sharp::AttrAsStr(options, "withXmp");
+  baton->withGainMap = sharp::AttrAsBool(options, "withGainMap");
   baton->timeoutSeconds = sharp::AttrAsUint32(options, "timeoutSeconds");
   baton->loop = sharp::AttrAsUint32(options, "loop");
   baton->delay = sharp::AttrAsInt32Vector(options, "delay");

src/pipeline.h

@@ -208,6 +208,7 @@ struct PipelineBaton {
   std::unordered_map<std::string, std::string> withExif;
   bool withExifMerge;
   std::string withXmp;
+  bool withGainMap;
   int timeoutSeconds;
   std::vector<double> convKernel;
   int convKernelWidth;
@@ -381,6 +382,7 @@ struct PipelineBaton {
     withMetadataOrientation(-1),
     withMetadataDensity(0.0),
     withExifMerge(true),
+    withGainMap(false),
     timeoutSeconds(0),
     convKernelWidth(0),
     convKernelHeight(0),

test/fixtures/index.js

@@ -70,6 +70,7 @@ module.exports = {
   inputJpgRandom: getPath('random.jpg'), // convert -size 200x200 xc:   +noise Random   random.jpg
   inputJpgThRandom: getPath('thRandom.jpg'), // convert random.jpg  -channel G -threshold 5% -separate +channel -negate thRandom.jpg
   inputJpgLossless: getPath('testimgl.jpg'), // Lossless JPEG from ftp://ftp.fu-berlin.de/unix/X11/graphics/ImageMagick/delegates/ljpeg-6b.tar.gz
+  inputJpgWithGainMap: getPath('gain-map.jpg'), // https://github.com/libvips/libvips/issues/3799
 
   inputPng: getPath('50020484-00001.png'), // http://c.searspartsdirect.com/lis_png/PLDM/50020484-00001.png
   inputPngGradients: getPath('gradients-rgb8.png'),

test/unit/gain-map.js

@@ -0,0 +1,69 @@
+/*!
+  Copyright 2013 Lovell Fuller and others.
+  SPDX-License-Identifier: Apache-2.0
+*/
+
+const { describe, it } = require('node:test');
+
+const sharp = require('../../');
+const fixtures = require('../fixtures');
+
+describe('Gain maps', () => {
+  it('Metadata contains gainMap', async (t) => {
+    t.plan(4);
+
+    const { format, gainMap } = await sharp(
+      fixtures.inputJpgWithGainMap,
+    ).metadata();
+    t.assert.strictEqual(format, 'jpeg');
+    t.assert.strictEqual(typeof gainMap, 'object');
+    t.assert.ok(Buffer.isBuffer(gainMap.image));
+    t.assert.strictEqual(gainMap.image.length, 31738);
+  });
+
+  it('Can be regenerated', async (t) => {
+    t.plan(4);
+
+    const data = await sharp(fixtures.inputJpgWithGainMap)
+      .withGainMap()
+      .toBuffer();
+    const metadata = await sharp(data).metadata();
+    t.assert.strictEqual(metadata.format, 'jpeg');
+    t.assert.strictEqual(typeof metadata.gainMap, 'object');
+    t.assert.ok(Buffer.isBuffer(metadata.gainMap.image));
+
+    const {
+      format,
+      width,
+      height,
+      channels,
+      depth,
+      space,
+      hasProfile,
+      chromaSubsampling,
+    } = await sharp(metadata.gainMap.image).metadata();
+
+    t.assert.deepEqual(
+      {
+        format,
+        width,
+        height,
+        channels,
+        depth,
+        space,
+        hasProfile,
+        chromaSubsampling,
+      },
+      {
+        format: 'jpeg',
+        width: 1920,
+        height: 1080,
+        channels: 1,
+        depth: 'uchar',
+        space: 'b-w',
+        hasProfile: true,
+        chromaSubsampling: '4:4:4',
+      },
+    );
+  });
+});

test/unit/jp2.js

@@ -45,11 +45,11 @@ describe('JP2 output', () => {
           assert.strictEqual('png', info.format);
           assert.strictEqual(8, info.width);
           assert.strictEqual(15, info.height);
-          assert.strictEqual(4, info.channels);
+          assert.strictEqual(3, info.channels);
         });
     });
 
-    it('JP2 quality', (done) => {
+    it('JP2 quality', (_t, done) => {
       sharp(fixtures.inputJp2)
         .resize(320, 240)
         .jp2({ quality: 70 })
@@ -65,7 +65,7 @@ describe('JP2 output', () => {
         });
     });
 
-    it('Without chroma subsampling generates larger file', (done) => {
+    it('Without chroma subsampling generates larger file', (_t, done) => {
       // First generate with chroma subsampling (default)
       sharp(fixtures.inputJp2)
         .resize(320, 240)
@@ -111,7 +111,7 @@ describe('JP2 output', () => {
     it('Invalid JP2 chromaSubsampling value throws error', () => {
       assert.throws(
         () => sharp().jp2({ chromaSubsampling: '4:2:2' }),
-        /Expected one of 4:2:0, 4:4:4 but received 4:2:2 of type string/
+        /Expected one of: 4:2:0, 4:4:4 for chromaSubsampling but received 4:2:2 of type string/
       );
     });
   }

test/unit/libvips.js

@@ -180,7 +180,7 @@ describe('libvips binaries', () => {
       process.env.npm_config_arch = 's390x';
       process.env.npm_config_libc = '';
       const locatorHash = libvips.yarnLocator();
-      assert.strictEqual(locatorHash, '4ab19140fd');
+      assert.strictEqual(locatorHash, '8cdba194cb');
       delete process.env.npm_config_platform;
       delete process.env.npm_config_arch;
       delete process.env.npm_config_libc;

test/unit/png.js

@@ -226,12 +226,11 @@ describe('PNG', () => {
       .png({ colours: 2, palette: false })
       .toBuffer();
 
-    const { channels, isPalette, bitsPerSample, paletteBitDepth, size, space } = await sharp(data).metadata();
+    const { channels, isPalette, bitsPerSample, paletteBitDepth, space } = await sharp(data).metadata();
     assert.strictEqual(channels, 1);
     assert.strictEqual(isPalette, false);
     assert.strictEqual(bitsPerSample, 1);
     assert.strictEqual(paletteBitDepth, undefined);
-    assert.strictEqual(size, 89);
     assert.strictEqual(space, 'b-w');
   });