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Independent alpha in gimp

Mar 9, 2012, 19:46
Post: #1
Independent alpha in gimp

I'm making textures for a game, for a material that needs a 24bit RGB for the normal texture, and alpha channel that controls the shinyness, specularity of the material. So in short, the alpha has nothing to do with transparency, but gimp handles it as transparency. However this isn't a real problem since i disable the layer mask, so it won't make the textures transparent.

The problem is: i have multiple layers a plain texture, which is multiplied by a baked ambient occlusion texture. But if i flatten the map to export as a png, then gimp applies the layer mask (alpha) to the layer where it is linked, then this layer gets multiplied with the baked layer, then the result is a 24bit rgb png, without alpha channel.
So is there a way to make alpha independent from any layers, as it controls totally different thing? Or i need to copy layermask delete it, flatten image and make a new layer mask on flattened image and paste the previously copied mask every time when i export the texture?
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