CIFilter Combination
问题 I'm trying to achieve the same effect that appears when you enter the menu in the Read Dead Redemption (RDR) game: After browsing the CIFilter library I found that the filter I'm looking for is CIColorMonochrome . After applying the filter on a sample image I get the following result: This looks great, however not quite the same effect as in the RDR picture. I'm going to have a number over the image and it needs to be clearly visible. Therefore, I was wondering if the is a filter that will