Contrasting Colours in C#

It’s still not perfect … but this is a bit of code another developer and I came up with a while ago for finding contrasting colours.

/// <summary>

/// From a given colour it works out a suitable colour that will sit on top of

/// it so that the contrast is suitable for readability.

/// </summary>

/// <param name="baseColor">Color to get the contrasting complement of</param>

/// <returns>Contrasting color</returns>

public static Color GetContrastingColor(Color baseColor)

{

    HSB baseHsb = ColorToHsb(baseColor);

    int newSaturation = baseHsb.Saturation;

    int newBrightness = baseHsb.Brightness;



    if ((baseHsb.Saturation >= 40 && baseHsb.Saturation <= 60) && (baseHsb.Brightness >= 40 && baseHsb.Brightness <= 60))

    {

        newSaturation = (baseHsb.Saturation <= 50 ? 100 : 0);

        newBrightness = (baseHsb.Brightness <= 50 ? 100 : 0);

    }

    else if (baseHsb.Saturation >= 40 && baseHsb.Saturation <= 60)

    {

        newSaturation = (baseHsb.Saturation <= 50 ? 100 : 0);

    }

    else if (baseHsb.Brightness >= 40 && baseHsb.Brightness <= 60)

    {

        newBrightness = (baseHsb.Brightness <= 50 ? 100 : 0);

    }

    else

    {

        newSaturation = 100 - baseHsb.Saturation;

        newBrightness = 100 - baseHsb.Brightness;

    }



    if (baseHsb.Saturation == 0)

    {

        newSaturation = 0;

    }

 

    HSB newHsb = new HSB(baseHsb.Hue, newSaturation, newBrightness);

    return HsbToColor(newHsb);

}