I think that this material is important to read:
http://www.w3.org/TR/compositing/
I wonder if it wouldn't be good to rethink the current Synfig blending
methods and modify them to stick strictly to the W3C standards. It would
allow to use external libraries without the issues I'm having with Cairo
operators.
Of course the old blend methods should still working inside Synfig but we
shouldn't continue using the non standard blending methods.
Also it might be interesting to separate the blending parameters in two.
First in what is called in the document "The Porter Duff compositing
operators" (that defines how the alpha are combined) and the "Blending"
that is the pure color combinations. I need to read the document completely
to profile this properly.
quote:
Porter Duff compositing takes into account the overall shape of the graphic
element and its opacity, as well as the opacity and shape of the backdrop,
and determines where the backdrop is visible, where the graphic element is
visible and where one is visible through the other. The blending step
determines how the colors from the graphic element and the backdrop
interact.
Any thoughts?
--
Carlos
http://synfig.org
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