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Modify pixels of a UIImage
func applyFilter(to image: UIImage) -> UIImage? {
guard let context = prepareContext(for: image),
let pixelBuffer = getPixelBuffer(from: context) else {
return nil
// TODO: Hier müssen wir die einzelnen Pixel im pixelBuffer modifizieren und wieder
// zurück in den pixelBuffer schreiben.
guard let outputCGImage = context.makeImage() else {
return nil
return UIImage(cgImage: outputCGImage, scale: image.scale, orientation: image.imageOrientation)
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