//=================================================
[DllImport("coredll.dll")]
internal static extern int GetDeviceCaps(
			IntPtr hdc, 
			int nIndex);

[DllImport("coredll.dll")]
internal extern static IntPtr GetDC( IntPtr windowHandle );

[DllImport("coredll.dll")]
internal static extern int ReleaseDC( 
			IntPtr hWnd, 
			IntPtr hDC );

internal const int BITSPIXEL  =   12;

public static bool IsMonoScreen()
{
   //Get Screen DC
   IntPtr hDC = GetDC(IntPtr.Zero);

   //Get number of bits per pixel
   int ires = GetDeviceCaps(hDC, BITSPIXEL);

   ReleaseDC(IntPtr.Zero, hDC);

   //If it's less than 4 it should be a B&W
   if (ires > 4)
	return false;
   else
	return true;			
}
//===========================================