我想从电话画廊中选择一张汽车照片，或者拍摄一张照片并更改其颜色。 我试着改变它的RGB。 但它不工作的照片，我添加到项目。 我怎么能做到呢？ 有没有我可以使用的库或任何对我有用的东西？ 这是我使用的代码。

func render() {
    let centerHueAngle: Float = defaultHue/360.0
    var destCenterHueAngle: Float = colorRange.value
    let minHueAngle: Float = (defaultHue - hueRange/2.0) / 360
    let maxHueAngle: Float = (defaultHue + hueRange/2.0) / 360
    let hueAdjustment = centerHueAngle - destCenterHueAngle
    if destCenterHueAngle == 0  {
        destCenterHueAngle = 1 //force red if slider angle is 0
    }
    let size = 64
    var cubeData = [Float](repeating: 0, count: size * size * size * 4)
    var rgb: [Float] = [0, 0, 0]
    var hsv: (h : Float, s : Float, v : Float)
    var newRGB: (r : Float, g : Float, b : Float)
    var offset = 0
    for z in 0 ..< size {
        rgb[2] = Float(z) / Float(size) // blue value
        for y in 0 ..< size {
            rgb[1] = Float(y) / Float(size) // green value
            for x in 0 ..< size {
                rgb[0] = Float(x) / Float(size) // red value
                hsv = RGBtoHSV(rgb[0], g: rgb[1], b: rgb[2])
                if hsv.h < minHueAngle || hsv.h > maxHueAngle {
                    newRGB.r = rgb[0]
                    newRGB.g = rgb[1]
                    newRGB.b = rgb[2]
                } else {
                hsv.h = destCenterHueAngle == 1 ? 0 : hsv.h - hueAdjustment //force red if slider angle is 360
                newRGB = HSVtoRGB(hsv.h, s:hsv.s, v:hsv.v)
                }
                cubeData[offset] = newRGB.r
                cubeData[offset+1] = newRGB.g
                cubeData[offset+2] = newRGB.b
                cubeData[offset+3] = 1.0
                offset += 4
            }
        }
    }
    let b = cubeData.withUnsafeBufferPointer { Data(buffer: $0) }
    let data = b as NSData
    let colorCube = CIFilter(name: "CIColorCube")!
    colorCube.setValue(size, forKey: "inputCubeDimension")
    colorCube.setValue(data, forKey: "inputCubeData")
    colorCube.setValue(ciImage, forKey: kCIInputImageKey)
    if let outImage = colorCube.outputImage {
        let context = CIContext(options: nil)
        let outputImageRef = context.createCGImage(outImage, from: outImage.extent)
        imgCar.image = UIImage(cgImage: outputImageRef!)
    }
}