Color.grayscale

public float grayscale ;

Description

Значение цвета в градациях серого. (Read Only)

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Color color = new Color(0.3F, 0.4F, 0.6F);
    void Example() {
        print(color.grayscale);
    }
}