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August 30, 2018 20:54
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Grayscale image
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extension UIImage { | |
var grayscaled: UIImage? { | |
guard let openGLContext = EAGLContext(api: .openGLES2) else { return self } | |
let ciContext = CIContext(eaglContext: openGLContext) | |
guard let currentFilter = CIFilter(name: "CIPhotoEffectNoir") else { return self } | |
currentFilter.setValue(CIImage(image: self), forKey: kCIInputImageKey) | |
if let output = currentFilter.outputImage, | |
let cgImage = ciContext.createCGImage(output, from: output.extent) { | |
return UIImage(cgImage: cgImage, scale: scale, orientation: imageOrientation) | |
} | |
return nil | |
} | |
} |
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