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Re: [css3-images] cross-fade()

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Mon, 9 May 2011 14:13:05 -0700
Message-ID: <BANLkTimA1_rOGo0cYWmszFOT_CMVvFGbTw@mail.gmail.com>
To: "L. David Baron" <dbaron@dbaron.org>
Cc: www-style@w3.org
On Mon, May 9, 2011 at 1:10 PM, L. David Baron <dbaron@dbaron.org> wrote:
> On Monday 2011-05-09 12:32 -0700, Tab Atkins Jr. wrote:
>> As explained above, we don't want 'dissolve', as it does the wrong
>> thing, particularly when both src and dst are fully opaque.  Instead
>> we want imagick's 'blend' operator, which uses the 'plus' operator.
>
> I think what the Porter-Duff paper calls dissolve() is what you call
> the global alpha.  We do still need that part.

Oh, okay.  I couldn't immediately find a PD reference for dissolve, so
I looked at imagick's reference, where the 'dissolve' operation is
roughly what the original definition of cross-fade() was.

~TJ
Received on Monday, 9 May 2011 21:13:52 GMT

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