> Date: Tue, 19 Apr 2011 22:42:24 +0200
> From: ofn...@laposte.net
> To: gimp-user@lists.XCF.Berkeley.EDU
> Subject: Re: [Gimp-user] Explicit manipulation of Alpha Channel.
> This is what layer masks are meant for.

More specifically, on the Layers menu, select "Add Layer Mask", with full 
opacity (white), then click on the mask icon from the Layers toolbox (it will 
appear next to the source layer) and start painting on it like you would any 
grayscale surface.  (You can toggle the "Show Layer Mask" option any time you 
want to see exactly what the mask layer by itself looks like.)  You can keep it 
this way for working, or when finished, select "Apply Layer Mask" to transfer 
the layer mask into the source layer's alpha channel.

-- Stratadrake
Numbers may not lie, but neither do they tell the whole truth.
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