public void Sub(byte[] nConstant, int nScaleFactor)
{
status = NPPNativeMethods.NPPi.SubConst.nppiSubC_8u_C3IRSfs(nConstant, _devPtrRoi, _pitch, _sizeRoi, nScaleFactor);
Debug.WriteLine(String.Format("{0:G}, {1}: {2}", DateTime.Now, "nppiSubC_8u_C3IRSfs", status));
NPPException.CheckNppStatus(status, this);
}