[Extract UIColor] Extract UIColor value at a specific point in a given UIImage (#UI)

gistfile1.m

- (UIColor *)colorForImage:(UIImage *)image atPoint:(CGPoint)point 
{
	CGDataProviderRef provider = CGImageGetDataProvider(image.CGImage);
	CFDataRef pixelData = CGDataProviderCopyData(provider);
	const UInt8* data = CFDataGetBytePtr(pixelData);

	int numberOfColorComponents = 4; // R,G,B, and A
	float positionX = point.x;
	float positionY = point.y;
	float imageWidth = image.size.width;
	int pixelInfo = (int)((imageWidth * positionY) + positionX) * numberOfColorComponents;

	UInt8 red = data[pixelInfo];
	UInt8 green = data[(pixelInfo + 1)];
	UInt8 blue = data[pixelInfo + 2];
	UInt8 alpha = data[pixelInfo + 3];
	CFRelease(pixelData);
	
	return [UIColor colorWithRed:	red/255.0f
					green:green/255.0f
					blue:blue/255.0f
					alpha:alpha/255.0f];
}

Copied and modified from http://zurb.com/forrst/posts/Retrieve_the_color_of_a_pixel_at_a_specific_poin-Gnd