extension CIImage {
func invert() -> CIImage? {
guard let invertFilter = CIFilter(name: "CIColorInvert") else {return nil}
invertFilter.setValue(self, forKey: kCIInputImageKey)
return invertFilter.outputImage
}
func convert(saturation: Double, bright: Double, contrast: Double) -> CIImage? {
guard let filter1 = CIFilter(name: "CIColorControls") else {return nil}
filter1.setValue(self, forKey: kCIInputImageKey)
filter1.setValue(saturation, forKey: "inputSaturation")
filter1.setValue(bright, forKey: "inputBrightness")
filter1.setValue(contrast, forKey: "inputContrast")
return filter1.outputImage
}
func temperatureAndTint(inTemp: CGFloat, outTemp: CGFloat) -> CIImage? {
guard let filter = CIFilter(name: "CITemperatureAndTint") else {return nil}
filter.setValue(self, forKey: kCIInputImageKey)
filter.setValue(CIVector(x: inTemp, y: 0), forKey: "inputNeutral")
filter.setValue(CIVector(x: outTemp, y: 0), forKey: "inputTargetNeutral")
return filter.outputImage
}
func rgbaMatrix() -> CIImage?
{
guard let filter = CIFilter(name: "CIColorMatrix") else {return nil}
let ciImage = self
filter.setValue(ciImage, forKey: kCIInputImageKey)
filter.setValue(CIVector(x: 1.0, y: 0, z: 0, w: 0.0), forKey: "inputRVector")
filter.setValue(CIVector(x: 0, y: 1.0, z: 0, w: 0.0), forKey: "inputGVector")
filter.setValue(CIVector(x: 0, y: 0, z: 1.0, w: 0.0), forKey: "inputBVector")
filter.setValue(CIVector(x: 0, y: 0, z: 0, w: 1), forKey: "inputAVector")
filter.setValue(CIVector(x: 0, y: 0, z: 0, w: 0), forKey: "inputBiasVector")
return filter.outputImage
}
}