This is a little hard to explain, so bear with me. I'm wanting to save out a series of diagram images in a sprite sheet for a website. Right now, I have it so that I have a white image with "holes" cut into it that make the diagram. I put a background behind that image and it colors the "holes."
The problem is, the parts not colored are white, and this sometimes looks bad if the sprite sheet goes against a non-white background (so it's a white box with a colored diagram on it).
Is there a way to save an image so that the white part could be transparent (or any color), but maintain the ability to also customize the diagram color?
I'm not sure this is possible, since the only way I can think of requires layers (which can't be saved for the web) but I'd appreciate any help! Thanks!