diff --git a/src/simg.js b/src/simg.js
index d1b0f16..1328915 100755
--- a/src/simg.js
+++ b/src/simg.js
@@ -48,6 +48,12 @@
 
         canvas.width = img.width;
         canvas.height = img.height;
+        context.imageSmoothingEnabled = false;
+        if(devicePixelRatio >= 2){
+          canvas.width *= 2;
+          canvas.height *= 2;
+          context.setTransform(2,0,0,2,0,0);
+        }
 
         context.drawImage(img, 0, 0);
         cb(canvas);