core-image

问题 I'm working on a simple MacOS command-line application in Swift. I created a custom CoreImage filter and having troubles to use it. The code compiles just fine but when it runs it exits with the following error: *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key inputImage.' Any help with this issue would be greatly appreciated. Tried searching for an answer on SO but since my

问题 I've read some posts which recommend the use of: UIGraphicsBeginImageContextWithOptions((image.size), NO, 0.0f) instead of: UIGraphicsBeginImageContext(image.size). Because the first one uses Retina-scale when drawing, otherwise you get blocky images. I'm a little confused about when to use or not the retina-scale option. If i have a photograph which is 1000x1000 px, and i call UIGraphicsBeginImageContext passing those dimensions, am i not specifying exactly how many points i want to draw? Is

问题 i have problem i try use filter at some images which have extension 3000x2000 , when i do it RAM upper and app have fatal error the "didReceiveMemoryWarning". func setFilters(images: [UIImage]) -> [UIImage] { let filter = CIFilter(name: "CIColorControls")! filter.setValue(2.0, forKey: kCIInputContrastKey) let context = CIContext(options: nil) var result = [UIImage]() for img in images { let newImage = autoreleasepool(invoking: { () -> UIImage in filter.setValue(CIImage(image: img)!, forKey:

问题 I have created blur image as below: //Blur the UIImage CIImage *imageToBlur = [CIImage imageWithCGImage:viewImage.CGImage]; CIFilter *gaussianBlurFilter = [CIFilter filterWithName: @"CIGaussianBlur"]; [gaussianBlurFilter setValue:imageToBlur forKey: @"inputImage"]; [gaussianBlurFilter setValue:[NSNumber numberWithFloat: 2] forKey: @"inputRadius"]; CIImage *resultImage = [gaussianBlurFilter valueForKey: @"outputImage"]; CIImage *finalImage = [resultImage imageByCroppingToRect:CGRectMake(0, 10,

问题 I wrote a function to apply the filter to a photo. Why the function always returns nil? func getImage() -> UIImage? { let openGLContext = EAGLContext(api: .openGLES2) let context = CIContext(eaglContext: openGLContext!) let coreImage = UIImage(cgImage: image.cgImage!) filter.setValue(coreImage, forKey: kCIInputImageKey) filter.setValue(1, forKey: kCIInputContrastKey) if let outputImage = filter.value(forKey: kCIOutputImageKey) as? CIImage { let output = context.createCGImage(outputImage, from

问题 I am getting an error when I try to implement CIHueAdjust. The app terminates with an error like: -[CIImage doubleValue]: unrecognized selector sent to instance 0xd6606d0 Here is the whole project:owolf.net/uploads/StackOverflow/HueAdjustProject.zip Here is the .m code: - (void)viewDidLoad { context = [CIContext contextWithOptions:nil]; hueFilter = [CIFilter filterWithName:@"CIHueAdjust"]; inputCGImage = imageView.image.CGImage; [super viewDidLoad]; } - (IBAction)hueSliderValueChanged:(id

问题 I cannot initialize CIDetector for reading QRCOde , It always remains nil. Here is my code : let options = [CIDetectorAccuracy: CIDetectorAccuracyHigh] self.detector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: options) If I replace CIDetectorTypeQRCode with CIDetectorTypeRectangle it get initialized but I need to read QRCode I am trying from last two days, Please help 回答1: Finally got that working: Follow the steps: Select XcodeProject Select Target Select BuildSettings

问题 This is really annoying me. When I convert a UIImage to a CIImage, apply a filter then convert back the image is upside down (for landscape) or rotated anticlockwise 90 degrees (for portrait). var image:UIImage? var index:Int? @IBOutlet weak var photo: UIImageView! @IBAction func editImage(sender: UIBarButtonItem) { println("editImage") let beginImage = CIImage(image: self.image) let filter = CIFilter(name: "CISepiaTone") filter.setValue(beginImage, forKey: kCIInputImageKey) filter.setValue(0

问题 I am planning to build an NSOpenGLView for an OS X app using SWIFT which can be used to apply Core Image Filter and effects to a video, so far I have worked on the code for the video Controller to add video playback, but I am not sure how to apply the filter to the video: class VideoMediaViewController: NSViewController { weak var mainView : DTMainViewController? @IBOutlet weak var aVPlayerView: AVPlayerView! var url:NSURL?{ didSet{ // this is the setter } } var observer:AnyObject? var player

问题 I have used CIVignette effect for My Photo Editing app. It applying based on Slider's Changing event. I have used following code and my issue is whenever I increased slider's value Vignette effect is appeared but whenever I decrease slider's value the Vignette effect does not decrease. Please Help. @IBAction func slider(_ sender: UISlider) { let startImage = CIImage(image: imgEdited!)! let vignetteFilter = CIFilter(name: "CIVignette")! let radius = 5 vignetteFilter.setValue(startImage, forKey