CompuServe Messages

Alpha & Opacity mapping

    01-Aug-95 22:56:03
Fm: david W. mennenoh 71561,2343
To: Joseph Giannasio A 74434,51
Joe, Well, I'd bet it's the way you're creating your alpha. In Pshop go to channels and verify you have a #4 and that it's a black and white image. Turn the #4 channel on and you should see a background color appear. You'll also see how the alpha is affecting the image better. I'll bet you'll see the same black edges and such. I've found the best way to create alphas in Pshop is by using layer masks. Make the #4 channel the active channel and then select it and copy it. (CTRL-A CTRL-C) Now go to layers and add a layer mask to your image. Select the mask as the working image and then paste in your alpha channel. Now you can add a background layer with just a solid color and interactively work on the edges of your matte. When you're finished you can remove the background and then flatten. The result will be a 32 bit .tga with a perfect alpha channel. Hope that helps. DM