On 01/14/2011 11:58 PM, Timothée Giet wrote:

"Doesn't the "alpha lock" do that?"

No, "alpha lock" locks alpha painting on the canvas where it is activated only.
This is not the same thing.
with blending mode I can have several painted layer under and paint only onto them..
all this in a group layer of course to don't paint on the background if there is one.
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Do you mean when you have several other layer and you create a new layer on top of them and paint
on the new layer, then the combined transparency (alpha channels) of the layers under the new layer
is copied to the new layer and the color is used from the brush?
If you mean this, it would actually be a cool idea. Would be pretty useful (at least for me :D), but this is not really
a blending mode (i mean, yes it somehow is but not really :D). I think the brush code would need some modifications for that. Can you tell me a program that support this (so i can try it out). I haven't found something like this in Gimp or Photoshop.