[Bf-cycles] Cycles loads RGBA textures "premultiplied"?

Zauber Paracelsus zauber at gridmail.org
Tue Mar 10 21:46:56 CET 2015

Well, that explains one problem of mine.  I use InsaneBump to generate 
some of the normal maps I use, and sometimes it generates them with an 
alpha channel (50% alpha on all pixels).  When it does this, the normal 
map becomes unusable with Cycles.

On 03/10/2015 04:44 PM, Jason Clarke wrote:
> I've noticed Cycles always loads RGBA textures with black in the transparent areas, as though the file was premultiplied. (Even if blender itself is loading the file with straight alpha). Why does it do this? Is there a way to disable it? It makes it impossible to store anything in a texture's alpha channel except actual transparency. Trying to store something like bump or roughness data in the alpha channel will ruin whatever is being stored in the RGB side.
> -Jason (JtheNinja)
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