using System;
using System.Runtime.InteropServices;

namespace ConsoleApplication1
{
    class Program
    {
        [DllImport("gdi32.dll")]
        public static extern bool SetDeviceGammaRamp(IntPtr hDC, ref Wolla lpwolla);

        [DllImport("user32.dll", EntryPoint = "GetDC")]
        public static extern IntPtr GetDC(IntPtr ptr);

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        public struct Wolla
        {
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
            public UInt16[] Red;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
            public UInt16[] Green;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)]
            public UInt16[] Blue;
        }

        static void Main(string[] args)
        {
            if (args.Length > 0)
            {
                Wolla wolla = new Wolla();

                wolla.Red = new ushort[256];
                wolla.Green = new ushort[256];
                wolla.Blue = new ushort[256];

                for (int i = 1; i < 256; i++)
                {
                    wolla.Red[i] = wolla.Green[i] = wolla.Blue[i] = (ushort)(Math.Min(65535, Math.Max(0, Math.Pow((i + 1) / 256.0, Convert.ToInt32(args[0]) * 0.1) * 65535 + 0.5)));
                }

                SetDeviceGammaRamp(GetDC(IntPtr.Zero), ref wolla);
            }
            else
            {
                Console.Write("Husk Gamma Værdi, mellem 3 og 44");
                Console.ReadLine();
            }
        }
    }
}