public IList<Color> ShadeColors(Color c1, Color c2, int resultCount)

 {

     var result = new List<Color>();

     for (int i = ; i < resultCount; i++)

     {

         var a = c1.A + (int)((c2.A - c1.A) * i / resultCount);

         var r = c1.R + (int)((c2.R - c1.R) * i / resultCount);

         var g = c1.G + (int)((c2.G - c1.G) * i / resultCount);

         var b = c1.B + (int)((c2.B - c1.B) * i / resultCount);

         var c = Color.FromArgb(a, r, g, b);

         result.Add(c);

     }

     return result;

 }

RUN apt-get update \

    && apt-get install -y --allow-unauthenticated \

    libc6-dev \

    libgdiplus \

    libx11-dev \

    && rm -rf /var/lib/apt/lists/*

 static void Main(string[] args)

 {

     int size = ;

     int h = ;

     var bmp = new Bitmap(size, h, PixelFormat.Format32bppArgb);

     Color c1 = Color.FromArgb(0xff, Color.Green);

     Color c2 = Color.FromArgb(0x4e, Color.Yellow);

     var cs = ShadeColors(c1, c2, size);

     for (int i = ; i < size; i++)

     {

         for (int j = ; j < h; j++)

         {

             bmp.SetPixel(i, j, cs[i]);

         }

     }

     bmp.Save("shade.png", ImageFormat.Png);

     Console.WriteLine("Hello World!");

     // Console.ReadLine();

 }