[Bf-cycles] Alpha pass independent from transparent option
bassam at urchn.org
Sat Dec 8 19:22:12 CET 2012
> This will be added, but not in the way it's done for blender
> This should be a feature of the image saving and dependent on
> image file format.
I have a question about this (possible future scenario):
Step 1- create a blend file, with some 3d layers to render. do comp
based on render, saving to a format that only allows key alpha. Do some
Step 2- make your comp based on ... what? now we don't know what the
alpha is for the renderlayers, because for instance, I don't know the
specifics of the file format... ok, lets say we find out and comp.
Step 3- switch the file to my 'final' rendering format, that say only
allows premul alpha. my comp is now broken, but I only find out after I
So I would make the following suggestion to avoid the ambiguity:
1- do as you said and switch key/premul based on output format (with a a
choice if the format allows both) in the output file settings.
2- allow switching key/premul in renderlayers regardless of output
format , and make them a sane and consistent default (regardless of
output format chosen, maybe something suitable for openexr).
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