/// <summary>
/// Returns the Contrast image.
/// </summary>
/// <returns>The Contrast image as a FileResult to be downloaded.</returns>
public FileResult Contrast()
{
var ImageProcessor = new ImageProcessor();
ImageProcessor.SetImage(DroppedImage);
var resultImg = ImageProcessor.Contrast(50, false);
ImageProcessor.UnlockImage();
MemoryStream str = new MemoryStream();
resultImg.Save(str, ImageFormat.Png);
str.Close();
return File(str.GetBuffer(), "application/octet-stream",
string.Format("{0}_Contrast.png",
Path.GetFileNameWithoutExtension(FileName)));
}