This might negate its own thread but... I'm interested in creating some kind of "hash" based on each image so that I'm not storing the same image in the database 100 times.

Any ideas on taking some "part" of the image and running through md5 to get a unique string? Obviously using the filename won't work because the same image might be named 10 different things.

I'm thinking maybe the "contents" of the image?

Thanks