Grayscale() public static méthode

public static Grayscale ( Bitmap b ) : Bitmap
b System.Drawing.Bitmap
Résultat System.Drawing.Bitmap
 private void cinzaToolStripMenuItem_Click(object sender, EventArgs e)
 {
     DstImg   = new Bitmap(OriImg);
     DstImg   = BitmapFilter.Grayscale(DstImg);
     ImgScale = 1;
     refreshImages();
 }