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Add AVIF/HEIF 'tune' option to control quality metrics #4227

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Lovell Fuller
2026-01-01 22:41:18 +00:00
parent 0d872bd13a
commit 006d37b2d0
10 changed files with 53 additions and 2 deletions
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2
docs/src/content/docs/api-output.md
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@@ -758,6 +758,7 @@ When using Windows ARM64, this feature requires a CPU with ARM64v8.4 or later.
| [options.effort] | <code>number</code> | <code>4</code> | CPU effort, between 0 (fastest) and 9 (slowest) |
| [options.chromaSubsampling] | <code>string</code> | <code>&quot;&#x27;4:4:4&#x27;&quot;</code> | set to '4:2:0' to use chroma subsampling |
| [options.bitdepth] | <code>number</code> | <code>8</code> | set bitdepth to 8, 10 or 12 bit |
| [options.tune] | <code>string</code> | <code>&quot;&#x27;iq&#x27;&quot;</code> | tune output for a quality metric, one of 'iq' (default), 'ssim' or 'psnr' |
**Example**
```js
@@ -797,6 +798,7 @@ globally-installed libvips compiled with support for libheif, libde265 and x265.
| [options.effort] | <code>number</code> | <code>4</code> | CPU effort, between 0 (fastest) and 9 (slowest) |
| [options.chromaSubsampling] | <code>string</code> | <code>&quot;&#x27;4:4:4&#x27;&quot;</code> | set to '4:2:0' to use chroma subsampling |
| [options.bitdepth] | <code>number</code> | <code>8</code> | set bitdepth to 8, 10 or 12 bit |
| [options.tune] | <code>string</code> | <code>&quot;&#x27;ssim&#x27;&quot;</code> | tune output for a quality metric, one of 'ssim' (default), 'psnr' or 'iq' |
**Example**
```js

5
docs/src/content/docs/changelog/v0.35.0.md
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@@ -8,6 +8,8 @@ slug: changelog/v0.35.0
* Breaking: Remove `install` script from `package.json` file.
Compiling from source is now opt-in via the `build` script.
* Breaking: AVIF output is now tuned using SSIMULACRA2-based `iq` quality metrics rather than `ssim`.
* Breaking: Remove deprecated `failOnError` constructor property.
* Breaking: Remove deprecated `paletteBitDepth` from `metadata` response.
@@ -18,6 +20,9 @@ slug: changelog/v0.35.0
* Deprecate Windows 32-bit (win32-ia32) prebuilt binaries.
* Add AVIF/HEIF `tune` option for control over quality metrics.
[#4227](https://github.com/lovell/sharp/issues/4227)
* Add `withGainMap` to process HDR JPEG images with embedded gain maps.
[#4314](https://github.com/lovell/sharp/issues/4314)