Generating an image to use as a hue value cheat sheet (hue in degrees, factor, bytes and hexadecimal)

huemap.cs

// HSV to RGB code from http://www.splinter.com.au/converting-hsv-to-rgb-colour-using-c/
// Other code by me
#r "System.Drawing";
using System.Drawing;

void HsvToRgb(double h, double S, double V, out int r, out int g, out int b)
{
  // T. Nathan Mundhenk mundhenk@usc.edu

  double H = h;
  while (H < 0) { H += 360; };
  while (H >= 360) { H -= 360; };
  double R, G, B;
  if (V <= 0)
    { R = G = B = 0; }
  else if (S <= 0)
  {
    R = G = B = V;
  }
  else
  {
    double hf = H / 60.0;
    int i = (int)Math.Floor(hf);
    double f = hf - i;
    double pv = V * (1 - S);
    double qv = V * (1 - S * f);
    double tv = V * (1 - S * (1 - f));
    switch (i)
    {

      // Red is the dominant color

      case 0:
        R = V;
        G = tv;
        B = pv;
        break;

      // Green is the dominant color

      case 1:
        R = qv;
        G = V;
        B = pv;
        break;
      case 2:
        R = pv;
        G = V;
        B = tv;
        break;

      // Blue is the dominant color

      case 3:
        R = pv;
        G = qv;
        B = V;
        break;
      case 4:
        R = tv;
        G = pv;
        B = V;
        break;

      // Red is the dominant color

      case 5:
        R = V;
        G = pv;
        B = qv;
        break;

      // Just in case we overshoot on our math by a little, we put these here. Since its a switch it won't slow us down at all to put these here.

      case 6:
        R = V;
        G = tv;
        B = pv;
        break;
      case -1:
        R = V;
        G = pv;
        B = qv;
        break;

      // The color is not defined, we should throw an error.

      default:
        //LFATAL("i Value error in Pixel conversion, Value is %d", i);
        R = G = B = V; // Just pretend its black/white
        break;
    }
  }
  r = Clamp((int)(R * 255.0));
  g = Clamp((int)(G * 255.0));
  b = Clamp((int)(B * 255.0));
}

int Clamp(int i)
{
  if (i < 0) return 0;
  if (i > 255) return 255;
  return i;
}

Bitmap bitmap = new Bitmap(1024, 128);

for (int x = 0; x < 1024; x++)
{
  int r = 0;
  int g = 0;
  int b = 0;
  HsvToRgb((x / 1024D) * 360D, 1, 1, out r, out g, out b);
  for (int y = 0; y < 128; y++)
  {
    bitmap.SetPixel(x, y, Color.FromArgb(byte.MaxValue, r, g, b));
  }
}

Graphics graphics = Graphics.FromImage(bitmap);
for (int i = 0; i < 1024; i += 24)
{
  graphics.DrawLine(p, i, 0, i, 32);
  graphics.DrawLine(p, i, 96, i, 127);
  graphics.DrawString((i / 1024D).ToString("0.00"), new Font("Lucida Console", 5), Brushes.Black, i - 8, 48 - 9);
  graphics.DrawString((i / (1024D / 360D)).ToString("000") + "°", new Font("Lucida Console", 5), Brushes.Black, i - 8, 64 - 9);
  graphics.DrawString((i / 4).ToString("000"), new Font("Lucida Console", 5), Brushes.Black, i - 8, 80 - 9);
  graphics.DrawString("0x" + (i / 4).ToString("X2").ToUpper(), new Font("Lucida Console", 5), Brushes.Black, i - 8, 96 - 9);
}

bitmap.Save("huemap.png", ImageFormat.Png);

// look for huemap.png