cifilter

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

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

问题 I have written a chromakey filter for making the backgrounds of MPEG movies transparent so that you can use a movie file for longer animations without the need for lengthy sequences of PNGs (as is commonly done for some types of iOS animations). I am using AVPlayer , AVVideoComposition , and a custom CIFilter to render the video over a background image. The background image can be changed dynamically by the user interacting with the app. This used to work just fine until iOS 10 came out and

问题 I have written a chromakey filter for making the backgrounds of MPEG movies transparent so that you can use a movie file for longer animations without the need for lengthy sequences of PNGs (as is commonly done for some types of iOS animations). I am using AVPlayer , AVVideoComposition , and a custom CIFilter to render the video over a background image. The background image can be changed dynamically by the user interacting with the app. This used to work just fine until iOS 10 came out and

问题 I have written a chromakey filter for making the backgrounds of MPEG movies transparent so that you can use a movie file for longer animations without the need for lengthy sequences of PNGs (as is commonly done for some types of iOS animations). I am using AVPlayer , AVVideoComposition , and a custom CIFilter to render the video over a background image. The background image can be changed dynamically by the user interacting with the app. This used to work just fine until iOS 10 came out and

问题 I am attempting to understand how CIAdditionCompositing works. As part of my testing, I have created a square mid-gray image: and a square black image: When I combined these two square images using a CIAdditionCompositing patch, I expected to see a gray square whose color matched the original mid-gray square exactly (because all color components of the black image have value 0). However, the final result is actually brighter than the original gray image: I don't understand how this result is

来源： https://stackoverflow.com/questions/58539078/rendering-a-video-in-a-calayer-hierarchy-using-cifilters

来源： https://stackoverflow.com/questions/58539078/rendering-a-video-in-a-calayer-hierarchy-using-cifilters

问题 I'm trying to generate QR code with following code : DispatchQueue.main.async { let image = generateQRCode(from: qrCodeString) } func generateQRCode(from string: String?) -> UIImage? { if let data = string?.data(using: .utf8, allowLossyConversion: false) { if let filter = CIFilter(name: "CIQRCodeGenerator") { filter.setValue(data, forKey: "inputMessage") let transform = CGAffineTransform(scaleX: 5, y: 5) if let output = filter.outputImage?.transformed(by: transform) { return UIImage(ciImage:

问题 I have CVPixelBufferRef from an AVAsset . I'm trying to apply a CIFilter to it. I use these lines: CVPixelBufferRef pixelBuffer = ... CVPixelBufferRef newPixelBuffer = // empty pixel buffer to fill CIContex *context = // CIContext created from EAGLContext CGAffineTransform preferredTransform = // AVAsset track preferred transform CIImage *phase1 = [CIImage imageWithCVPixelBuffer:pixelBuffer]; CIImage *phase2 = [phase1 imageByApplyingTransform:preferredTransform]; CIImage *phase3 = [self