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Image img=Image.FromFile("c:\\back.bmp");
Graphics g=Graphics.FromImage(img);
g.DrawString("CIAO BABY",new Font("Arial",15),new SolidBrush(Color.Black),new RectangleF(0,0,300,300),StringFormat.GenericDefault);
img.Save("C:\\prova.tif",System.Drawing.Imaging.ImageFormat.Tiff);