Merge pull request #182 from wangcheng/wangcheng678-patch-1

use image naturalHeight and naturalHeight

Author: lokesh

src/color-thief.js

@@ -31,8 +31,8 @@ import core from './core.js';
 const CanvasImage = function (image) {
     this.canvas  = document.createElement('canvas');
     this.context = this.canvas.getContext('2d');
-    this.width  = this.canvas.width  = image.width;
-    this.height = this.canvas.height = image.height;
+    this.width  = this.canvas.width  = image.naturalWidth;
+    this.height = this.canvas.height = image.naturalHeight;
     this.context.drawImage(image, 0, 0, this.width, this.height);
 };