MattRix

using UnityEngine;
using UnityEngine.UI;
using System.Collections.Generic;

[RequireComponent(typeof(CanvasRenderer))]
public class SimpleGraphic : MaskableGraphic //could extend Graphic if you don't need it maskable
{
	public Texture texture;
	
	public override Texture mainTexture

XProger

mode               out color                                                    out alpha
--------------     --------------                                               -----------
layer/over:    (   sc+(1-sa)*dc                                              ,  sa+da-sa*da   )
multiply:      (   sc*dc                                                     ,  sa+da-sa*da   )
screen:        (   sa*da - (da-dc)*(sa-sc)                                   ,  sa+da-sa*da   )
lighten:       (   max(sa*dc,sc*da)                                          ,  sa+da-sa*da   )
darken:        (   min(sa*dc,sc*da)                                          ,  sa+da-sa*da   )
add:           (   min(dc+sc,1)                                              ,  min(sa+da,1)  )
subtract:      (   max(dc-sc,0)                                              ,  min(sa+da,1)  )
difference:    (   abs(sa*dc-sc*da)                                          ,  sa+da-sa*da   )