Larry before I go too far, let me know if you like the comments like this: http://ideone.com/WaZfr
That is the comment in imagebufalgo.cpp. In imagebufalgo.h I have the canonical formulas like this: http://ideone.com/enHbV Before all blend modes I have a comment where I say that I use the general compositing formula for Over, and notation I use: A - non-premultiplied color a - pre-multiplied color aa - alpha value for a Same for input image B.
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