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Expose PNG output options requiring libimagequant #1484

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Lovell Fuller
2019-01-12 18:26:53 +00:00
parent bd377438b6
commit 98797445de
8 changed files with 211 additions and 74 deletions
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5
docs/api-output.md
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@@ -154,6 +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.force` **[Boolean][6]** force PNG output, otherwise attempt to use input format (optional, default `true`)
### Examples

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docs/changelog.md
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@@ -17,6 +17,9 @@ Requires libvips v8.7.0.
* Expose `pages` and `pageHeight` metadata for multi-page input images.
[#1205](https://github.com/lovell/sharp/issues/1205)
* Expose PNG output options requiring libimagequant.
[#1484](https://github.com/lovell/sharp/issues/1484)
* Expose underlying error message for invalid input.
[#1505](https://github.com/lovell/sharp/issues/1505)