Programmatically choose high-contrast colors

Question

This should be a simple question, but I haven\'t been able to find a way to make it work.

Essentially, I have a silly localhost page that I use in my webdevelopment.

Answer 1

Thanks to @starblue !

Here is C# code that I use

 public static string GetContrastBlackOrWhiteColorAsHtmlColorCode(Color c)
        {
            System.Drawing.Color color = System.Drawing.ColorTranslator.FromHtml("transparent");

            try
            {
                if (c.R >= 128 && c.G >= 128 && c.B >= 128)
                {
                    return System.Drawing.ColorTranslator.ToHtml(Color.Black);
                }
                else
                {
                    return System.Drawing.ColorTranslator.ToHtml(Color.White);
                }
            }
            catch (Exception)
            {
            }

            return System.Drawing.ColorTranslator.ToHtml(color);
        }