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private void memory_Click(object sender, EventArgs e)
{
if (curBitmap != null)
{
myTimer.ClearTimer();
myTimer.Start();
Rectangle rect = new Rectangle(0, 0, curBitmap.Width, curBitmap.Height);
System.Drawing.Imaging.BitmapData bmpData = curBitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, curBitmap.PixelFormat);
IntPtr ptr = bmpData.Scan0;
int bytes = curBitmap.Width * curBitmap.Height*3 ;
byte[] rgbValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, rgbValues, 0, bytes);
double colorTemp = 0;
for (int i = 0; i < rgbValues.Length; i += 3)
{
colorTemp = rgbValues[i + 2] * 0.299 + rgbValues[i + 1] * 0.587 + rgbValues[i] * 0.114;
rgbValues[i] = rgbValues[i + 1] = rgbValues[i + 2] = (byte)colorTemp;
}
System.Runtime.InteropServices.Marshal.Copy(rgbValues, 0, ptr, bytes);
curBitmap.UnlockBits(bmpData);
myTimer.Stop();
timeBox.Text = myTimer.Duration.ToString("####.##") + " 毫秒";
Invalidate();
}
}
Image img = Image.FromFile("a.jpg");//打开jpg
img.Save("b.gif", ImageFormat.Gif);//保存gif,默认8位色
img.Dispose();//释放图片
img = Image.FromFile("b.gif");//读取gif图
img.Save("c.bmp", ImageFormat.Bmp);//保存位图,此时位图为8位色
img.Save("d.jpg", ImageFormat.Jpeg);//保存"8位色效果"的jpg