graustufenholokaust.mm

  NSBitmapImageRep* imageRep = [[NSBitmapImageRep alloc] initWithData:[img TIFFRepresentation]];
	
	int x = [imageRep size].width - 300;
	int y = 170;
	
	float avg = 0.0;
	float totalcnt = 0;
	for (int _y  = y; _y < y + 120; _y++) {
		for (int _x = x; _x < x + 270; _x++) {
			NSColor* color = [imageRep colorAtX: (_x) y: ([imageRep size].height - _y)];
			NSColor *rgbColor = [color colorUsingColorSpaceName: NSCalibratedRGBColorSpace];
			if (!rgbColor)
				continue;

			float avgGray = ([rgbColor redComponent] + [rgbColor greenComponent] + [rgbColor blueComponent]) / 3.0;
			avg += avgGray;
			totalcnt += 1.0;
			[imageRep setColor: [NSColor redColor] atX: _x y: ([imageRep size].height - _y)];
		}
	}
//	[[imageRep TIFFRepresentation] writeToFile: [tagPath stringByAppendingPathComponent: @"ficken.tiff"] atomically: NO];
	float avgGray = avg/totalcnt;
	NSColor *color = (avgGray >= 0.65) ? [NSColor blackColor] : [NSColor whiteColor];