36b.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
//UI使うのに必要
using UnityEngine.UI;
//DOTween使うのに必要
using DG.Tweening;

public class ScreenColor : MonoBehaviour
{
    public Image image;

    void Start()
    {
        //Color(赤、緑、青、透明度)
        //どれも数値は0～1まで
        var color = new Color(1f, 0f, 1f, 0f);

        //(色、かかる時間）
        image.DOColor(color, 5f);
    }
}