public void RGBToGray(NPPImage_8uC1 dest)
{
status = NPPNativeMethods.NPPi.RGBToGray.nppiRGBToGray_8u_C3C1R(_devPtrRoi, _pitch, dest.DevicePointerRoi, dest.Pitch, _sizeRoi);
Debug.WriteLine(String.Format("{0:G}, {1}: {2}", DateTime.Now, "nppiRGBToGray_8u_C3C1R", status));
NPPException.CheckNppStatus(status, this);
}