Tinting a grayscale NSImage (or CIImage)

Question

I have a grayscale image which I want to use for drawing Cocoa controls. The image has various levels of gray. Where it is darkest, I want it to draw a specified tint color dark

Answer 1

For a more fine grained, you can use a polynomial color approach, using the approach that I suggested in the following: How can I display the spinning NSProgressIndicator in a different color?