> What about a desaturation filter? How could that be quickly implemented?
:dest_alpha_mask? The much more terrible and obscure
:source_atopfrom Cocoa? :D
NSCompositeSourceAtopbut I think it's a terrible name:
> Source image wherever both images are opaque, destination image wherever destination image is opaque but source image is transparent, and transparent elsewhere. (R = S*Da + D*(1 - Sa))
> R => The premultiplied result color.
> S => The source color
> D => The destination color
> Sa => The alpha value of the source color
> Da => The alpha value of the destination color
NSCompositingOperationconstants anyway to get some inspiration.
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