I need to draw a PNG image on Canvas. Now I'm saving the image as a BMP and tranparent drawing works. But some PNG images have parts (like shadows on image) that merges with background. in PhotoImpact, I fill the backgroung with some color and the shadow become a real shadow, meging with background color. but on BMPs this don't happen. The mask color become transparent, but shadow part don't.
I need draw the PNG image on Canvas respecting the PNG instructions of transparency, like shadows need to work.
One example of an PNG of my example can be downloaded at: http://entropymine.com/jason/testbed/pngtrans/rgba8_bk.png