Benjamin Rister wrote:
Thanks, I didn't know if there was a cleaner way than doing it pixel- by-pixel myself; the info on reasonable tolerances is also quite helpful.
Image subtraction or differencing is an image-processing operation. Consider looking in that domain. E.g. look for an Obj-C library that performs generalized image-processing on NSImage types.
Also, some image-processing can be synthesized from image-compositing operations and judicious use of constant (e.g. all-white, all-black, etc.) images. Look at the formulas for the NSCompositeXX values and apply some algebra.
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