gistfile1.txt

@implementation NSImage (RSShading)

- (NSImage *) tintedImage
{
	NSImage* newImage = [[[NSImage alloc] initWithSize:[self size]] autorelease];
	NSRect imageRect = {NSZeroPoint, [self size]};
	NSColor *color = [NSColor blackColor];

	[newImage lockFocus];
	[[color colorWithAlphaComponent: 0.25] set];
	[self compositeToPoint:NSZeroPoint operation:NSCompositeCopy];
	NSRectFillUsingOperation (imageRect, NSCompositeSourceOver);
	[newImage unlockFocus];

	return (newImage);
}

@end