On 04/19/2011 10:35 PM, Frederico Zveiter wrote:

Hi Folks,

Can anyone teach me how to do the steps described in the article "How do I Import Alpha Textures?"
(http://unity3d.com/support/documentation/Manual/HOWTO-alphamaps.html) but with GIMP?

Is special, how can I create an explicit alpha channel that I can manipulate?

This is what layer masks are meant for.

________________________________
Date: Tue, 19 Apr 2011 22:42:24 +0200 From: ofnuts@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 strata_ranger@hotmail.com
--------------------
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On 04/20/2011 11:20 AM, Richard Gitschlag wrote:

... elision by patrick ...
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.

What a beautiful elegant description. Clear and complete. Nice writing.

Patrick