ARCed.Core.QColorMatrix.ScaleOpacity C# (CSharp) Method

        public void ScaleOpacity(float scaleOpacity)
        {
            this.ScaleOpacity(scaleOpacity, MatrixOrder.MatrixOrderPrepend);
        }

 /// <summary>
 /// Changes the opacity of an image. 
 /// </summary>
 /// <param name="image">Image to change</param>
 /// <param name="opacity">Opacity change to apply (0..255)</param>
 /// <remarks>Values out of range will be automatically corrected</remarks>
 public static void ChangeOpacity(Image image, int opacity)
 {
     using (var newImage = new Bitmap(image))
     {
         using (var g = Graphics.FromImage(image))
         {
             var imageAttr = new ImageAttributes();
             var qm = new QColorMatrix();
             qm.ScaleOpacity(opacity.Clamp(0, 255) / 255.0f);
             imageAttr.SetColorMatrix(qm.ToColorMatrix());
             var destRect = new Rectangle(new Point(), image.Size);
             g.Clear(Color.Transparent);
             g.DrawImage(newImage, destRect, 0, 0, image.Width, image.Height,
                 GraphicsUnit.Pixel, imageAttr);
         }
     }
 }