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Docs: clarify some output features require custom libvips

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Lovell Fuller 2019-04-25 11:39:30 +01:00
parent 0890b59c32
commit 7ae0512b9b
2 changed files with 18 additions and 18 deletions
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18
docs/api-output.md
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@ -115,13 +115,13 @@ Use these JPEG options for output image.
- `options.quality` **[Number][8]** quality, integer 1-100 (optional, default `80`)
- `options.progressive` **[Boolean][6]** use progressive (interlace) scan (optional, default `false`)
- `options.chromaSubsampling` **[String][1]** set to '4:4:4' to prevent chroma subsampling when quality <= 90 (optional, default `'4:2:0'`)
- `options.trellisQuantisation` **[Boolean][6]** apply trellis quantisation, requires mozjpeg (optional, default `false`)
- `options.overshootDeringing` **[Boolean][6]** apply overshoot deringing, requires mozjpeg (optional, default `false`)
- `options.optimiseScans` **[Boolean][6]** optimise progressive scans, forces progressive, requires mozjpeg (optional, default `false`)
- `options.trellisQuantisation` **[Boolean][6]** apply trellis quantisation, requires libvips compiled with support for mozjpeg (optional, default `false`)
- `options.overshootDeringing` **[Boolean][6]** apply overshoot deringing, requires libvips compiled with support for mozjpeg (optional, default `false`)
- `options.optimiseScans` **[Boolean][6]** optimise progressive scans, forces progressive, requires libvips compiled with support for mozjpeg (optional, default `false`)
- `options.optimizeScans` **[Boolean][6]** alternative spelling of optimiseScans (optional, default `false`)
- `options.optimiseCoding` **[Boolean][6]** optimise Huffman coding tables (optional, default `true`)
- `options.optimizeCoding` **[Boolean][6]** alternative spelling of optimiseCoding (optional, default `true`)
- `options.quantisationTable` **[Number][8]** quantization table to use, integer 0-8, requires mozjpeg (optional, default `0`)
- `options.quantisationTable` **[Number][8]** quantization table to use, integer 0-8, requires libvips compiled with support for mozjpeg (optional, default `0`)
- `options.quantizationTable` **[Number][8]** alternative spelling of quantisationTable (optional, default `0`)
- `options.force` **[Boolean][6]** force JPEG output, otherwise attempt to use input format (optional, default `true`)
@ -154,11 +154,11 @@ Indexed PNG input at 1, 2 or 4 bits per pixel is converted to 8 bits per pixel.
- `options.progressive` **[Boolean][6]** use progressive (interlace) scan (optional, default `false`)
- `options.compressionLevel` **[Number][8]** zlib compression level, 0-9 (optional, default `9`)
- `options.adaptiveFiltering` **[Boolean][6]** use adaptive row filtering (optional, default `false`)
- `options.palette` **[Boolean][6]** quantise to a palette-based image with alpha transparency support, requires libimagequant (optional, default `false`)
- `options.quality` **[Number][8]** use the lowest number of colours needed to achieve given quality, requires libimagequant (optional, default `100`)
- `options.colours` **[Number][8]** maximum number of palette entries, requires libimagequant (optional, default `256`)
- `options.colors` **[Number][8]** alternative spelling of `options.colours`, requires libimagequant (optional, default `256`)
- `options.dither` **[Number][8]** level of Floyd-Steinberg error diffusion, requires libimagequant (optional, default `1.0`)
- `options.palette` **[Boolean][6]** quantise to a palette-based image with alpha transparency support, requires libvips compiled with support for libimagequant (optional, default `false`)
- `options.quality` **[Number][8]** use the lowest number of colours needed to achieve given quality, requires libvips compiled with support for libimagequant (optional, default `100`)
- `options.colours` **[Number][8]** maximum number of palette entries, requires libvips compiled with support for libimagequant (optional, default `256`)
- `options.colors` **[Number][8]** alternative spelling of `options.colours`, requires libvips compiled with support for libimagequant (optional, default `256`)
- `options.dither` **[Number][8]** level of Floyd-Steinberg error diffusion, requires libvips compiled with support for libimagequant (optional, default `1.0`)
- `options.force` **[Boolean][6]** force PNG output, otherwise attempt to use input format (optional, default `true`)
### Examples

18
lib/output.js
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@ -144,13 +144,13 @@ function withMetadata (withMetadata) {
* @param {Number} [options.quality=80] - quality, integer 1-100
* @param {Boolean} [options.progressive=false] - use progressive (interlace) scan
* @param {String} [options.chromaSubsampling='4:2:0'] - set to '4:4:4' to prevent chroma subsampling when quality <= 90
* @param {Boolean} [options.trellisQuantisation=false] - apply trellis quantisation, requires mozjpeg
* @param {Boolean} [options.overshootDeringing=false] - apply overshoot deringing, requires mozjpeg
* @param {Boolean} [options.optimiseScans=false] - optimise progressive scans, forces progressive, requires mozjpeg
* @param {Boolean} [options.trellisQuantisation=false] - apply trellis quantisation, requires libvips compiled with support for mozjpeg
* @param {Boolean} [options.overshootDeringing=false] - apply overshoot deringing, requires libvips compiled with support for mozjpeg
* @param {Boolean} [options.optimiseScans=false] - optimise progressive scans, forces progressive, requires libvips compiled with support for mozjpeg
* @param {Boolean} [options.optimizeScans=false] - alternative spelling of optimiseScans
* @param {Boolean} [options.optimiseCoding=true] - optimise Huffman coding tables
* @param {Boolean} [options.optimizeCoding=true] - alternative spelling of optimiseCoding
* @param {Number} [options.quantisationTable=0] - quantization table to use, integer 0-8, requires mozjpeg
* @param {Number} [options.quantisationTable=0] - quantization table to use, integer 0-8, requires libvips compiled with support for mozjpeg
* @param {Number} [options.quantizationTable=0] - alternative spelling of quantisationTable
* @param {Boolean} [options.force=true] - force JPEG output, otherwise attempt to use input format
* @returns {Sharp}
@ -221,11 +221,11 @@ function jpeg (options) {
* @param {Boolean} [options.progressive=false] - use progressive (interlace) scan
* @param {Number} [options.compressionLevel=9] - zlib compression level, 0-9
* @param {Boolean} [options.adaptiveFiltering=false] - use adaptive row filtering
* @param {Boolean} [options.palette=false] - quantise to a palette-based image with alpha transparency support, requires libimagequant
* @param {Number} [options.quality=100] - use the lowest number of colours needed to achieve given quality, requires libimagequant
* @param {Number} [options.colours=256] - maximum number of palette entries, requires libimagequant
* @param {Number} [options.colors=256] - alternative spelling of `options.colours`, requires libimagequant
* @param {Number} [options.dither=1.0] - level of Floyd-Steinberg error diffusion, requires libimagequant
* @param {Boolean} [options.palette=false] - quantise to a palette-based image with alpha transparency support, requires libvips compiled with support for libimagequant
* @param {Number} [options.quality=100] - use the lowest number of colours needed to achieve given quality, requires libvips compiled with support for libimagequant
* @param {Number} [options.colours=256] - maximum number of palette entries, requires libvips compiled with support for libimagequant
* @param {Number} [options.colors=256] - alternative spelling of `options.colours`, requires libvips compiled with support for libimagequant
* @param {Number} [options.dither=1.0] - level of Floyd-Steinberg error diffusion, requires libvips compiled with support for libimagequant
* @param {Boolean} [options.force=true] - force PNG output, otherwise attempt to use input format
* @returns {Sharp}
* @throws {Error} Invalid options