ColorConverter.cs

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using System;
using UnityEngine;
 
public class ColorConverter
{
    private const float Epsilon = 0.008856f;
 
    private const float Kappa = 903.3f;
 
    private static readonly Xyz WhiteReference = new Xyz
    {
        X = 95.047f,
        Y = 100f,
        Z = 108.883f
    };
 
    public static Lab RgbToLab(Color rgb)
    {
        return XyzToLab(RgbToXyz(rgb));
    }
 
    public static Lab XyzToLab(Xyz xyz)
    {
        Xyz whiteReference = WhiteReference;
        float num = PivotXyz(xyz.X / whiteReference.X);
        float num2 = PivotXyz(xyz.Y / whiteReference.Y);
        float num3 = PivotXyz(xyz.Z / whiteReference.Z);
        return new Lab
        {
            L = Math.Max(0f, 116f * num2 - 16f),
            A = 500f * (num - num2),
            B = 200f * (num2 - num3)
        };
    }
 
    private static float PivotXyz(float n)
    {
        if (!(n > 0.008856f))
        {
            return (903.3f * n + 16f) / 116f;
        }
        return CubicRoot(n);
    }
 
    private static float CubicRoot(float n)
    {
        return Mathf.Pow(n, 1f / 3f);
    }
 
    public static Xyz RgbToXyz(Color rgb)
    {
        float num = PivotRgb(rgb.r);
        float num2 = PivotRgb(rgb.g);
        float num3 = PivotRgb(rgb.b);
        return new Xyz
        {
            X = num * 0.4124f + num2 * 0.3576f + num3 * 0.1805f,
            Y = num * 0.2126f + num2 * 0.7152f + num3 * 0.0722f,
            Z = num * 0.0193f + num2 * 0.1192f + num3 * 0.9505f
        };
    }
 
    private static float PivotRgb(float n)
    {
        return ((n > 0.04045f) ? Mathf.Pow((n + 0.055f) / 1.055f, 2.4f) : (n / 12.92f)) * 100f;
    }
}