GetComponent<Image>().color code example

Example 1: how to change image color unity

using UnityEngine.UI;

public GameObject YourgameObjectWithImage;
YourgameObjectWithImage.GetComponent<Image>().color = new Color32(255, 255, 225, 225);

Example 2: unity change color of image script

image.GetComponent<Image>().color = new Color32(255,255,225,100);