ColorComparer.cs

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using UnityEngine;
 
public static class ColorComparer
{
    public static float Compare(Color colorA, Color colorB)
    {
        Lab lab = ColorConverter.RgbToLab(colorA);
        Lab lab2 = ColorConverter.RgbToLab(colorB);
        return Mathf.Sqrt(Distance(lab.L, lab2.L) + Distance(lab.A, lab2.A) + Distance(lab.B, lab2.B));
    }
 
    private static float Distance(float a, float b)
    {
        return (a - b) * (a - b);
    }
}