I am hoping someone can tell me why Photoshop changes grayscale values when pasted from the clipboard.
For example, I have a 24-bit bitmap on the clipboard that has every value set to (128,128,128). When I paste it into Photoshop the RGB values become (149,149,149) and (150,150,150), and not (128,128,128) like they should be.
It makes importing alpha maps pretty much useless for me.
Check your color settings. Most likely the conversion from RGB <-> Gray uses different gammas, and thus changes the values.