image masking

CGImageRef myMaskedImage;
const float myMaskingColors[6] = {124, 255,  68, 222, 0, 165};
myColorMaskedImage = CGImageCreateWithMaskingColors (image,
                                        myMaskingColors);
CGContextDrawImage (context, myContextRect, myColorMaskedImage);


CGImageRef myMaskedImage;
const float myMaskingColors[6] = { 0, 124, 0, 68, 0, 0 };
myColorMaskedImage = CGImageCreateWithMaskingColors (image,
                                        myMaskingColors);
CGContextDrawImage (context, myContextRect, myColorMaskedImage);


CGImageRef myMaskedImage;
const float myMaskingColors[6] = { 0, 124, 0, 68, 0, 0 };
myColorMaskedImage = CGImageCreateWithMaskingColors (image,
                                        myMaskingColors);
CGContextSetRGBFillColor (myContext, 0.6373,0.6373, 0, 1);
CGContextFillRect(context, rect);
CGContextDrawImage(context, rect, myColorMaskedImage);


CGImageCreateWithMask