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How can I blend two images in additive blending mode with Core Graphics?
The enum does not have something like a kCGBlendModeAdd: http://developer.apple.com/library/ios/documentation/GraphicsImaging/Reference/CGContext/Reference/reference.html#//apple_ref/doc/c_ref/CGBlendMode
Any solution?
What is wrong with
kCGBlendModePlusLighter?From the linked document:
So that is an additive blending capped at 1.0.