Color.grayscale

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public float grayscale;

Description

The grayscale value of the color. (Read Only)

Unity uses the following formula to calculate the grayscale value: (0.299f * Color.r) + (0.587f * Color.g) + (0.114f * Color.b).

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        Color newColor = new Color(0.3f, 0.4f, 0.6f);
        print(newColor.grayscale);
    }
}