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Darken image

I've got an NSImage (a file icon) I'm successfully drawing using

[[self image] drawInRect:imageRect
fromRect:theRect
operation:NSCompositeSourceOver
fraction:1.0];

Now I want to "select" it (like NSToolbar, the Finder, the Dock and everybody else does), which means making it darker. How should I do that, while preserving transparency? I've tried several combinations of operations and fractions, nothing did what I need.

andy
--
Discussion forthcoming.



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