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

The above solution didn't work for me. But this much easier solution works great for me

- (NSImage *)imageTintedWithColor:(NSColor *)tint
{
    NSImage *image = [self copy];
    if (tint) {
        [image lockFocus];
        [tint set];
        NSRect imageRect = {NSZeroPoint, [image size]};
        NSRectFillUsingOperation(imageRect, NSCompositeSourceIn);
        [image unlockFocus];
    }
    return image;
}

Answer 2

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?