I just tried 2 Xmas Stars with Terry's code, looks like a complicated thing using a mask and requiring image object to fit exactly inside image width and height... I don't know. It didn't allow a simple substitution of images of 2 other objects. Damn might have to read the directions, all is lost ;-))
If Terry wants to try here are 2 images to check with collision code colors are red 255, blue 255 and clear or black background.
If Terry wants to try here are 2 images to check with collision code colors are red 255, blue 255 and clear or black background.
b = b + ...