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matmen merged 2 commits into from
Oct 15, 2026
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colorToAlpha (#39) #52

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52efb4f
colorToAlpha (#39)
matmen Oct 15, 2026
378b4a5
document that colorToAlpha removes the color everywhere
matmen Oct 15, 2026
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document that colorToAlpha removes the color everywhere 
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ljnxm1Qjrocq1izGajLx8J
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@matmen @claude
matmen and claude committed Oct 15, 2026
commit 378b4a5019e0827a7b85b5f2ba86a13c4379cd11
1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -19,6 +19,7 @@
run length encoded 24/32 bit files.
- **`colorToAlpha(color, options)`** (#39): makes a color transparent like GIMP's "Color to Alpha", antialiased edges
become translucent instead of keeping a fringe of the removed color. Without a color, the top left pixel's is used.
The color is removed everywhere in the image, not only from a connected background.

### Deprecated

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4 changes: 3 additions & 1 deletion src/image.ts
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Expand Up @@ -1181,7 +1181,9 @@ export class Image {
/**
* Makes a color transparent, like GIMP's "Color to Alpha": the color is removed from every pixel and replaced by
* transparency, so pixels that are partly the color (e.g. antialiased edges against a background) become
* semi-transparent instead of keeping a fringe of it
* semi-transparent instead of keeping a fringe of it.
* The color is removed everywhere in the image, not only from a connected background: removing a white
* background also makes white areas inside the subject (e.g. eyes in a logo) transparent
* @param color The color to remove, by default the color of the top left pixel (e.g. a background)
* @param options See {@link ColorToAlphaOptions}
*/
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