JSFiddle - React, Tailwind, and code Playground

HTML

<canvas id="cnv" width="32" height="32">

JavaScript

var img = new Image(),
    cnv = document.getElementById('cnv');

var context = cnv.getContext('2d');
img.crossOrigin = 'anonymous';
img.onload = function () {

 	context.drawImage(img, 0, 0, 32, 32);
 alert(context.getImageData(15,15,1,1).data.join())
   // alert('finished drawing');
 				
}

img.src = 'https://dl.dropboxusercontent.com/s/4e90e48s5vtmfbd/aaa.png';