关于图片叠加字符问题

Question

seeCreating a Watered Photograph with GDI+ for .NET
http://www.codeproject.com/csharp/water.asp

Answer 1

你先用bitmap對象把圖片打開.
再用drawtext繪制文字

Answer 2

System.Drawing.Image image = System.Drawing.Image.FromFile( Server.MapPath( imgPhyName ) );
System.Drawing.Image newImage = new Bitmap( image.Width, image.Height, PixelFormat.Format32bppRGB );
Graphics graphics = Graphics.FromImage( newImage );
graphics.DrawImage( image, 0, 0,image.Width, image.Height );
Font font = new Font( FontType.SelectedItem.Text, Int32.Parse( FontSize.SelectedItem.Text ) );
Brush brush = new SolidBrush( Color.Red );
graphics.DrawString( "Hello,World!", font, brush, 10, 140 );
graphics.Dispose();
newImage.Save( Server.MapPath( newImgPhyName ), ImageFormat.JPEG );