Get the colour of the screen's current colour filter

Question

The following code SETS the colour filter of the screen to a specific colour.

How can I instead GET the colour of the screen?

[DllImport(\"GDI32.dll\")]
         


        

Answer 1

I adapted this other post to form the following answer:

[DllImport("gdi32.dll")]
public static extern int GetDeviceGammaRamp(IntPtr hDC, ref RAMP lpRamp);
[DllImport("user32.dll")]
public static extern IntPtr GetDC(IntPtr hWnd);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct RAMP
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
    public UInt16[] Red;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
    public UInt16[] Green;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
    public UInt16[] Blue;
}

private Color getScreenColor()
{
    RAMP r = new RAMP();
    GetDeviceGammaRamp(GetDC(IntPtr.Zero), ref r);
    return Color.FromArgb(r.Red[1], r.Green[1], r.Blue[1]);
}