GetThumbnailImage 缩放图像会严重失真

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace BYS2012

{

public partial class Form6 : Form

{

public Form6()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

Image.GetThumbnailImageAbort myCallback = new Image.GetThumbnailImageAbort(ThumbnailCallback);

Bitmap myBitmap = new Bitmap("D:\\pqimg\\" + "IMG_2537.jpg");

int y = (int)1440 * myBitmap.Height / myBitmap.Width;

Image myThumbnail = myBitmap.GetThumbnailImage(1440,y, myCallback, IntPtr.Zero);

myThumbnail.Save("D:\\pqimg2\\" + "IMG_2537.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

MessageBox.Show("ok");

}

public bool ThumbnailCallback()

{

return false;

}

}

}