private static System.Drawing.Image GrayScale(ref System.Drawing.Image source) { Bitmap bitMap = new Bitmap(source); using (Graphics g = Graphics.FromImage(bitMap)) { System.Drawing.Imaging.ColorMatrix matrix = new System.Drawing.Imaging.ColorMatrix( new float[][] { new float[] {.3f, .3f, .3f, 0, 0}, new float[] {.59f, .59f, .59f, 0, 0}, new float[] {.11f, .11f, .11f, 0, 0}, new float[] {0, 0, 0, 1, 0}, new float[] {0, 0, 0, 0, 1} }); System.Drawing.Imaging.ImageAttributes attributes = new System.Drawing.Imaging.ImageAttributes(); attributes.SetColorMatrix(matrix); g.DrawImage(source, new Rectangle(0, 0, source.Width, source.Height), 0, 0, source.Width, source.Height, GraphicsUnit.Pixel, attributes); } return (System.Drawing.Image)bitMap; }
Posted: March 18, 2023
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