Hello I would like to use as many envi functions as possible to accomplish the following, but if needed, I can also do some stuff in IDL. What I would like to do is create something like a transparency to overlay on a gray scale image. The transparency will be made up of red pixels that correspond to the original gray scale image. I can do this using the 8 color scheme and changing the color table, but I want to find a way to do this using the True color scheme. Thanks for your time, Afsheen Khan