You can do arbitrary blend modes in PD with GLSL as you suspect. take
a look at http://001.vade.info/?page_id=20 which has shaders for video
mixers (a through a+b to b blending, not just a+b) with most
photoshop blend modes.
You can use them verbatim with PD (Marius Schebella has some patches I
think).
Feel free to use them as you wish, or hack them apart :)
On Dec 25, 2009, at 3:07 PM, Matteo Sisti Sette wrote:
Matteo Sisti Sette escribió:
Basically, in the mentioned example you compute a resulting
gl_FracColor which is what is called the "source color".
Well well, I am far from sure this is correct, this is just my
understanding, and I don't even know whether for example lighting
information is applied before or after this stage, but in the
simplified case of a flat rectangle with no lighting, that becomes
irrelevant...
--
Matteo Sisti Sette
matteosistise...@gmail.com
http://www.matteosistisette.com
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