private void GreyScale()
{
Bitmap b = new Bitmap(pictureBox1.Image);
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height),ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte* p = (byte*)(void*)Scan0;
int nOffset = stride – b.Width * 3;
byte red, green, blue,tmp;
for (int y = 0; y < b.Height; ++y)
{
for (int x = 0; x < b.Width; ++x)
{
blue = p[0];
green = p[1];
red = p[2];
tmp = (byte)((red + green + blue) / 3);
if (tmp <= 100)
{
tmp = 1;
}
else
{
tmp = 255;
}
p[0] = p[1] = p[2] = tmp;
p += 3;
}
}
}
b.UnlockBits(bmData);
pictureBox1.Image = b;
}

saya copy ke VS2010 tidak bisa,
mohon pencerahan GAN