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Re: [css3-background] should specify color space for box-shadow blurring

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Fri, 30 Sep 2011 17:59:58 -0700
Message-ID: <CAAWBYDAuE10KDjtcMHmtq6dRC7HXcmAoS37XUZMkGNtaFoiuXg@mail.gmail.com>
To: Brian Manthos <brianman@microsoft.com>
Cc: "L. David Baron" <dbaron@dbaron.org>, "www-style@w3.org" <www-style@w3.org>
On Fri, Sep 30, 2011 at 5:51 PM, Brian Manthos <brianman@microsoft.com> wrote:
> Further, if varying opacity alone impacts color space, then the CSS3 Values WD needs correction because this assertion would be incorrect:
>
> http://www.w3.org/TR/css3-images/#color-stop-syntax
> # Note that transitions where either the transparency or the color
> # are held constant (for example, transitioning between rgba(255,0,0,100%)
> # and rgba(0,0,255,100%) or rgba(255,0,0,100%) and rgba(255,0,0,0%)) have
> # identical results whether the color interpolation is done in premultiplied
> # or non-premultiplied color-space. Differences only arise when both the color
> # and transparency differ between the two endpoints.

Nope, that's still correct.  In that note I'm talking about the
difference between premultiplied and non-premultiplied spaces.  sRGB
vs linearRGB is a completely different story.

~TJ
Received on Saturday, 1 October 2011 01:00:45 GMT

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