How can I make my Series 60 application's icon semi-transparent. In other words, I need to provide a mask that's not only black and white, but containing shades of gray (or something similar) that identifies the transparency value of each pixel. I already tried providing masks but it produces funny results. How can I know what color value in the mask stands for what transparency value, or even better, can this be generated by some tool?

Thank you,
Sammy