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douglashill/NSColor+DHLuminance.m

Last active August 29, 2015 14:08
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NSColor+DHLuminance.m
@implementation NSColor (DHLuminance)
- (CGFloat)dh_luminance
{
return 0.3 * [self redComponent] + 0.6 * [self greenComponent] + 0.1 * [self blueComponent];
}
@end
// Example usage for an attributed string:
// NSForegroundColorAttributeName : [colour dh_luminance] > 0.45 ? [NSColor blackColor] : [NSColor colorWithWhite:0.9 alpha:1]
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