C# - Add watermark to the photo by special way

Question

I need add watermark to the photo by special way. I know how to do it, but I dunno how to do it the same way as in article http://www.photoshopessentials.com/photo-effects/c

Answer 1

If you create your copyright image so that it is translucent and has a transparent background like this (using Paint.NET):

you can create a TextureBrush from it and use that to draw the copyright over the original image:

private void button2_Click(object sender, EventArgs e)
{
    using (Image image = Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\Desert.jpg"))
    using (Image watermarkImage = Image.FromFile(@"C:\Users\Public\Pictures\Sample Pictures\watermark.png"))    
    using (Graphics imageGraphics = Graphics.FromImage(image))
    using (Brush watermarkBrush = new TextureBrush(watermarkImage))
    {
        imageGraphics.FillRectangle(watermarkBrush, new Rectangle(new Point(0, 0), image.Size));
        image.Save(@"C:\Users\Public\Pictures\Sample Pictures\Desert_watermark.jpg");
    }
}

which produces this result: