Change rgb colors of UIImage with given multipliers [0-2]

UpdateRGBColors.swift

/// Update image RGB colors with sliders
    public func updateImageColorsWith(multiplier: [CGFloat], of: UIImage) -> UIImage {
        
        guard let inputCGImage = of.cgImage else {
            print("Unable to get cgImage")
            return of
        }
        
        let colorSpace       = CGColorSpaceCreateDeviceRGB()
        let width            = inputCGImage.width
        let height           = inputCGImage.height
        let bytesPerPixel    = 4
        let bitsPerComponent = 8
        let bytesPerRow      = bytesPerPixel * width
        let bitmapInfo       = RGBA32.bitmapInfo
        
        guard let context = CGContext(data: nil,
                                      width: width,
                                      height: height,
                                      bitsPerComponent: bitsPerComponent,
                                      bytesPerRow: bytesPerRow,
                                      space: colorSpace,
                                      bitmapInfo: bitmapInfo) else {
            print("Cannot create context!");
            return of
        }
        
        context.draw(inputCGImage, in: CGRect(x: 0, y: 0, width: width, height: height))
        
        guard let buffer = context.data else {
            print("Cannot get context data!")
            return of
        }
        
        let pixelBuffer = buffer.bindMemory(to: RGBA32.self, capacity: width * height)
        
        for row in 0 ..< Int(height) {
            for column in 0 ..< Int(width) {
                
                let offset = row * width + column
                var fRed = CGFloat(pixelBuffer[offset].redComponent) * multiplier[0]
                if fRed > 255 { fRed = 255 }
                let redColor = UInt8(fRed);
                
                var fGreen = CGFloat(pixelBuffer[offset].greenComponent) * multiplier[1]
                if fGreen > 255 { fGreen = 255 }
                let greenColor = UInt8(fGreen)
                
                var fBlue = CGFloat(pixelBuffer[offset].blueComponent) * multiplier[2]
                if fBlue > 255 { fBlue = 255 }
                let blueColor = UInt8(fBlue)
                
                pixelBuffer[offset] = RGBA32(red: redColor, green: greenColor, blue: blueColor, alpha: pixelBuffer[offset].alphaComponent)
            }
        }
        
        guard let outputCGImage = context.makeImage() else {
            print("Cannot make image!")
            return of
        }
        
        return UIImage(cgImage: outputCGImage, scale: image.scale, orientation: image.imageOrientation)
    }