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Photoshop F.A.Q (Last Updated: 2024 Nov 26 6:58 am)

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Subject: I forgot

bonestructure opened this issue on Mar 07, 2005 · 2 posts
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bonestructure ( ) posted Mon, 07 March 2005 at 12:59 PM · edited Thu, 14 November 2024 at 11:06 AM

I should know how to do this but somehow I've forgotten. My illness affects memory badly. How do I strip the alpha channel out of a tiff image to make a bump map?

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crocodilian ( ) posted Tue, 08 March 2005 at 10:32 AM

Couple of things-- the Alpha channel is not generally used for a bump map; bump maps reflect roughness of a surface. . .alpha corresponds to transparency. I assume that what you're trying to do is to take the alpha and create a new image, jpg or whatever, for use in the alpha channel of a 3d app like Max, right? Open the tiff in Photoshop, go to the layers, copy the alpha layer, then create a new greyscale file and paste the alpha there. . .now you have a file which is the alpha from your original Tiff. But again, this is generally not what you want for a bump map.

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