[Webkit-unassigned] [Bug 150940] Color interpolation for colors with alpha incorrect (gradients)

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Nov 6 10:38:33 PST 2015


--- Comment #8 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
(In reply to comment #7)
> > "with the interpolation taking place in premultiplied RGBA space"
> > but that text is expected to change once Mac and iOS can support
> > interpolation in non-premultiplied.
> Mh, I'm a little confused now as I'm not quite familiar with this
> terminology. Is interpolation in premultiplied RGBA what we are seeing now
> or what would be the correct thing to do?

That's what you're seeing now. Transparent red in premultiplied color just becomes transparent, so any time you interpolate from it you end up with grayish intermediate values.

> Why would that text change once Core Graphics decides to ship a fix for this bug?

Because all browsers would then be able to interpolate in non-premultiplied color, and the CSS working group would change the text (at least for the next level of the spec).

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