Swift / iOS - Extract Color from Image

ViewController.swift

func extractColor(image: UIImage){
  let pixel = UnsafeMutablePointer<CUnsignedChar>.alloc(4)
  let colorSpace:CGColorSpace = CGColorSpaceCreateDeviceRGB()
  let bitmapInfo = CGBitmapInfo(CGImageAlphaInfo.PremultipliedLast.rawValue)
  let context = CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorSpace, bitmapInfo)
  CGContextDrawImage(context, CGRectMake(0, 0, 1, 1), image.CGImage)

  var color: UIColor? = nil
        
  if pixel[3] > 0 {
      var alpha:CGFloat = CGFloat(pixel[3]) / 255.0
      var multiplier:CGFloat = alpha / 255.0
      
      color = UIColor(red: CGFloat(pixel[0]) * multiplier, green: CGFloat(pixel[1]) * multiplier, blue: CGFloat(pixel[2]) * multiplier, alpha: alpha)
  }else{
      
      color = UIColor(red: CGFloat(pixel[0]) / 255.0, green: CGFloat(pixel[1]) / 255.0, blue: CGFloat(pixel[2]) / 255.0, alpha: CGFloat(pixel[3]) / 255.0)
  }
        
  if color != nil {
      println( self.toHexString(color!) )
  }
  pixel.dealloc(4)
}
    
func toHexString(color: UIColor) -> String {
  var r:CGFloat = 0
  var g:CGFloat = 0
  var b:CGFloat = 0
  var a:CGFloat = 0
        
  color.getRed(&r, green: &g, blue: &b, alpha: &a)
        
  let rgb:Int = (Int)(r*255)<<16 | (Int)(g*255)<<8 | (Int)(b*255)<<0
        
  return String(format:"#%06x", rgb)
}

I had a case to extract vibrant color from the current camera capture. So capturing the camera image was fine but extracting the color took a while to I put the final working function here.