How to store grayscale (offset map) in normal map alpha in *Photoshop*?

[Jonathan]

Google didn't help.

I can't seem to figure out how to put a grayscale image for the offset map/displacement map in the alpha map channel of a normal map, which is 32-bit, TGA.

I checked the channels, and can of course delete/add an alpha channel at will, but how to I make the grayscale image the alpha channel in Photoshop?

I know it's probably simple. I normally just import it into an editor separate, but some engines, you have to have it stored with the normals map to work.

[doylle]

You can just copy paste it into the alpha channel in PS. Although you might need to make it a greyscale image before you copy it, i'm not realy sure about that last part.

gl

[Jonathan]

YAAAAAAAAAAAAAAAAY it worked. I had tried the grayscale trick, but didn't try it with the copy-and-paste.

So just for future reference for anyone else, convert the black/white dispplacement / offset map to a grayscale image (or "greyscale" if you're in the UK ) and paste it on the alpha channel under the Channels tab.

Seems simple, but I was making it difficult, like usual.

Thanks Doylle!