Re: [csswg-drafts] [css-images-4] sRGBA assumption on gradients, and premultiplied other color spaces (#5669)

> 1. The `<<color>>` token links to CSS Color 3, which only allows sRGB values. CSS Color 4, which is the current work, allows other RGB spaces, CMYK, Lab, and LCH.

This has been fixed, Images 4 now links to the `&lt;color>` definition in CSS Color 5

> 2\. the section [coloring the gradient line](https://drafts.csswg.org/css-images-3/#coloring-gradient-line) says that
> 
> 
> > Between two color stops, the gradient line’s color is interpolated between the colors of the two color stops, with the interpolation taking place in premultiplied RGBA space
> 
> which would force all colors to be
> 
> a) converted to sRGB, resulting in gamut mapping b) interpolated in sRGB gamma-encoded space.

This is also fixed:

> with the interpolation taking place in the specified color space, with missing components handled as defined in [CSS Color 4 § 12.2 Interpolating with Missing Components](https://www.w3.org/TR/css-color-4/#interpolation-missing), hue interpolation as defined in [CSS Color 4 § 12.4 Hue Interpolation](https://www.w3.org/TR/css-color-4/#hue-interpolation), and using premultiplied alpha, as defined in [CSS Color 4 § 12.3 Interpolating with Alpha](https://www.w3.org/TR/css-color-4/#interpolation-alpha).

This issue can now be closed

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Received on Tuesday, 9 September 2025 09:56:36 UTC