How to convert Hex to RGB?

Question

I am trying to use this to figure out if a color is light or dark

Evaluate whether a HEX value is dark or light

Now. It takes in a int

Answer 1

A little of topic, but here is an extension method to the Color struct I've created to calculate Luminance with different algorithms. Hope it helps you.

public static class ColorExtensions
{
    /// 

    /// Gets the luminance of the color. A value between 0 (black) and 1 (white)
    /// 
    /// The color.
    /// The type of luminance alg to use.
    /// A value between 0 (black) and 1 (white)
    public static double GetLuminance(this Color color, LuminanceAlgorithm algorithm = LuminanceAlgorithm.Photometric)
    {
        switch (algorithm)
        {
            case LuminanceAlgorithm.CCIR601:
                return (0.2126 * color.R + 0.7152 * color.G + 0.0722 * color.B) / 255;

            case LuminanceAlgorithm.Perceived:
                return (Math.Sqrt(0.241 * Math.Pow(color.R, 2) + 0.691 * Math.Pow(color.G, 2) + 0.068 * Math.Pow(color.B, 2)) / 255);

            case LuminanceAlgorithm.Photometric:
                return (0.299 * color.R + 0.587 * color.G + 0.114 * color.B) / 255;
        }

    }

   /// 

   /// The luminances
   /// 
   public enum LuminanceAlgorithm
   {
       /// 

       /// Photometric/digital ITU-R
       /// 
       Photometric,

       /// 

       /// Digital CCIR601 (gives more weight to the R and B components, as preciev by the human eye)
       /// 
       CCIR601,

       /// 

       /// A perceived luminance
       /// 
       Perceived
   }
}