Hi,

I've been trying out that approach but one thing concerns me. As far as I know, transparency setting methods like image.putalpha() in python set an alpha layer on top of the image. If I set alpha to 0, I lose the outline. If I set alpha to a very low number, the colors of brain regions retain, which interferes with my interpretation of the data. Do you know of any other workaround, preferably in Python/Matlab?
Thanks!

Anh.