http://www.switchonthecode.com/tutorials/csharp-tutorial-image-editing-saving-cropping-and-resizing

The method takes two objects - the image to crop (System.Drawing.Image) and the rectangle to crop out (System.Drawing.Rectangle). The next thing done is to create a Bitmap (System.Drawing.Bitmap) of the image. The only thing left is to crop the image. This is done by cloning the original image but only taking a rectangle of the original.

private static Image cropImage(Image img, Rectangle cropArea)
{
Bitmap bmpImage = new Bitmap(img);
Bitmap bmpCrop = bmpImage.Clone(cropArea,
bmpImage.PixelFormat);
return (Image)(bmpCrop);
}
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黃臉婆--冠上夫姓了 哈

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