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Hi all,I'm trying to move app from Android to iOS but I'm finding some difficulties with image transformation...The app is about image filtering and I found all the equivalent codes for brightness, saturation, contrast, etc. ColorMatrix but I have problems trying to colorize the image.In Android I used the next code:public static Bitmap doNalaFilter (Bitmap src) { Bitmap bmBrown0 = Bitmap.createBitmap(src.getWidth(), src.getHeight(), src.getConfig()); Canvas cBrown0 = new Canvas(bmBrown0); Paint paintBrown0 = new Paint(); paintBrown0.setColorFilter(new LightingColorFilter(Color.WHITE, 0x800000)); cBrown0.drawBitmap(src, 0, 0, paintBrown0); Bitmap bmBrown = Bitmap.createBitmap(src.getWidth(), src.getHeight(), src.getConfig()); Canvas cBrown = new Canvas(bmBrown); cBrown.drawBitmap(src, 0, 0, null); Paint paintBrown = new Paint(); paintBrown.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY)); cBrown.drawBitmap(bmBrown0, 0, 0, paintBrown); return bmBrown; }Which results in a new image with high brown tones.In Swift I'm trying the next code:func nalaFilter() -> UIImage? { let inImage = CIImage (image: self) let SRGBImage = inImage?.applyingFilter("CILinearToSRGBToneCurve") dynamic let brownMatrix = CIFilter (name: "CIMultiplyBlendMode") let brownRect = CGRect ( x: (SRGBImage?.extent.origin.x)!, y: (SRGBImage?.extent.origin.y)!, width: (SRGBImage?.extent.size.width)!, height: (SRGBImage?.extent.size.height)!) let brownColor = CIColor (red: 128.0/255.0, green: 0.0, blue: 0.0) let brownOverlay = CIImage (color: brownColor) let brownCroppedImage = brownOverlay.cropped(to: brownRect) brownMatrix?.setValue(SRGBImage, forKey: kCIInputImageKey) brownMatrix?.setValue(brownCroppedImage, forKey: kCIInputBackgroundImageKey) let brownOutImage = brownMatrix?.outputImage let linearImage = brownOutImage?.applyingFilter("CISRGBToneCurveToLinear") let cgImage = CIContext().createCGImage(linearImage!, from: linearImage!.extent) return UIImage (cgImage: cgImage!) }Which results in the original image with like a really really dark brown crystal on it...I can't find the equivalent code and it's so frustrating because I've tryed even all CICategoryCompositeOperation in my brownMatrix.Thanks in advance!