http://snippets.dzone.com/posts/show/1484#related

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;

public static byte[] CropImageFile(byte[] imageFile, int targetW, int targetH, int targetX, int targetY)
{
Image imgPhoto = Image.FromStream(new MemoryStream(imageFile));
Bitmap bmPhoto = new Bitmap(targetW, targetH, PixelFormat.Format24bppRgb);
bmPhoto.SetResolution(72, 72);
Graphics grPhoto = Graphics.FromImage(bmPhoto);
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;
grPhoto.PixelOffsetMode = PixelOffsetMode.HighQuality;
grPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, targetW, targetH), targetX, targetY, targetW, targetH, GraphicsUnit.Pixel);
// Save out to memory and then to a file. We dispose of all objects to make sure the files don't stay locked.
MemoryStream mm = new MemoryStream();
bmPhoto.Save(mm, System.Drawing.Imaging.ImageFormat.Jpeg);
imgPhoto.Dispose();
bmPhoto.Dispose();
grPhoto.Dispose();
return mm.GetBuffer();
}
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王小雀

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