ApplyWatermark.ApplyWatermark.Mark C# (CSharp) Method

        public Image Mark( Image image, string waterMarkText )
        {
            WatermarkText = waterMarkText;

            Bitmap originalBmp = (Bitmap)image;

            // avoid "A Graphics object cannot be created from an image that has an indexed pixel format." exception
            Bitmap tempBitmap = new Bitmap(originalBmp.Width, originalBmp.Height);
            // From this bitmap, the graphics can be obtained, because it has the right PixelFormat
            Graphics g = Graphics.FromImage(tempBitmap);

            using (Graphics graphics = Graphics.FromImage(tempBitmap))
            {
                // Draw the original bitmap onto the graphics of the new bitmap
                g.DrawImage(originalBmp, 0, 0);
                var size =
                    graphics.MeasureString(WatermarkText, Font);
                var brush =
                    new SolidBrush(Color.FromArgb(255, Color));
                graphics.DrawString
                    (WatermarkText, Font, brush,
                    GetTextPosition(image, size));
            }

            return tempBitmap as Image;
        }