[Bf-committers] [Bf-blender-cvs] SVN commit: /data/svn/bf-blender [13715] trunk/blender/source/blender/src/ drawimage.c: Images in the image editor were being draw with the wrong glBlendFunc() command

Stéphane SOPPERA stephane.soppera at wanadoo.fr
Sun Feb 24 11:43:29 CET 2008

>> I think ton wants to make
>> everything work in key alpha anyway,
> Also that idea was rejected in the meantime... it's a nasty topic that  
> needs more evaluation.
> But definitely it's like this:
> Key alpha is for:
> - painting (Image window)
> - composite operations on alpha only (like making masks)
> - while rendering a pixel (is a bit like painting...)
> Premul alpha is for:
> - subsampling
> - filtering / blurring
> - scaling
> - mipmap, etc.
Premul is the default result a composition of two images, like the 
AlphaOver node, and it also make the composition quicker, right?

What do you mean when writing "composite operations on alpha only" above?


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