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[css-color-4] Rephrase interpolation to be more generic wrt to interpolation spac #6060

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svgeesus merged 1 commit into from
Mar 2, 2021
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[css-color-4] Rephrase interpolation to be more generic wrt to interpolation spac #6060

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30 changes: 15 additions & 15 deletions css-color-4/Overview.bs
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Expand Up @@ -4403,7 +4403,7 @@ Interpolation</h2>

In general, interpolation between <<color>> values
occurs by linearly interpolating each component of the computed value of the color
separately, in Lab.
separately, in a given color space which will be referred to as the 'interpolation space' below.

<!--

Expand Down Expand Up @@ -4441,26 +4441,26 @@ Interpolation</h2>

<h3 id="interpolation-space">
Color space for interpolation</h3>

Issue(5928):

Colors are first converted to Lab
and then interpolated as Lab colors.
Host syntax can override the interpolation color space and specify which color space is used for interpolation.
<!-- For example, 'color-mix' and 'color-adjust' override the default to LCH. -->

The exception is that if all the <<color>>s to be interpolated
are sRGB values, and they are all expressed in a legacy syntax
such as hex colors, named colors,
Different color spaces may be more appropriate for each interpolation use case.
For example, Lab works well for gradients, and LCH works well for color mixing.
The host syntax may define what the default interpolation space should be for each case,
and optionally provide syntax for authors to override this default.

If the host syntax does not define what colorspace interpolation should take place in,
it defaults to Lab. In that case, user agents may handle interpolation
between legacy sRGB color formats
(hex colors, named colors,
''rgb()'', ''hsl()'' or ''hwb()''
(and the equivalent alpha-including forms)
then they are interpolated in gamma-encoded sRGB space.

and the equivalent alpha-including forms)
in gamma-encoded sRGB space.
This provides Web compatibility; legacy sRGB content interpolates in the sRGB space by default.

This also means that authors can choose to opt-in to Lab interpolation
by using the non-legacy ''color(srgb r g b)'' form.

Issue(5928):


<h3 id="interpolation-alpha">
Interpolating with alpha</h3>

Expand Down