Okay, this is kinda hard to explain, but I'll try..
Y'know how most images are square? Even if you paint something non-square it has this white box around it. I was wondering if it is possible to make the background of the image the same color as the background of whatever page you post it at, like a dynamic background or something. That white square really is annoying. Can you do this in any way, like with photoshop, or is it just impossible?