HSL to RGB Color conversion

ColorHelpers.cs

internal static class ColorHelpers
{
    /// <summary>
    /// Converts HSL color value to RGB fractional color value
    /// </summary>
    /// <param name="hue">Hue angle value between [0,360]</param>
    /// <param name="saturation">Saturation value between [0,1]</param>
    /// <param name="lightness">Lightness value between [0,1]</param>
    /// <returns>RGB color values, with each value between [0,1]</returns>
    /// <see href="https://en.wikipedia.org/wiki/HSL_and_HSV#HSL_to_RGB_alternative"/>
    public static (double r, double g, double b) HslToRgb(double hue, double saturation, double lightness)
    {
        // Normalize hue angle
        hue %= 360;
        if (hue < 0)
        {
            hue += 360;
        }

        double a = saturation * Math.Min(lightness, 1 - lightness);

        double GetChannel(int n)
        {
            double k = (n + hue / 30) % 12;
            return (lightness - a * Math.Max(-1, Math.Min(Math.Min(k - 3, 9 - k), 1)));
        }

        return (GetChannel(0), GetChannel(8), GetChannel(4));
    }

    /// <summary>
    /// Converts HSL color value to RGB integer color value
    /// </summary>
    /// <param name="hue">Hue angle value between [0,360]</param>
    /// <param name="saturation">Saturation value between [0,1]</param>
    /// <param name="lightness">Lightness value between [0,1]</param>
    /// <returns>The <see cref="Color"/> equivalent of the input HSL values</returns>
    public static Color HslToRgbColor(double hue, double saturation, double lightness)
    {
        (double r, double g, double b) = HslToRgb(hue, saturation, lightness);

        return Color.FromArgb(
            (byte)Math.Min(255, r * 256),
            (byte)Math.Min(255, g * 256),
            (byte)Math.Min(255, b * 256)
            );
    }
}