1/25/2014 - 12:42 AM

A Pen by Nathan Hackley.

A Pen by Nathan Hackley.

Dynamic Image Blurring with Pixastic

Dynamic, client-side image blur effect with and Pixastic JavaScript library.

A Pen by Nathan Hackley on CodePen.


<h1>Dynamic Image Blurring with JS</h1>
<p>This is a demo of dynamic (in the sense that it works with any image, and processing is performed on the user's browser) image blurring with vanilla JavaScript.</p>
<p>I saw this effect used beautifully on <A href="">Rdio</a>, where they have (low res) track/album artwork form part of the page's background (100% width; ~1440px wide!)</p>
<p>My implementation achieves that effect using a JavaScript image processing library called <a href="">Pixastic</a>. The only disadvantage is it doesn't offer any callback functions, so you can't hide the image 'til it's processed... Or maybe you can, and I just don't know how. I am definitely going to play with this more.</p>
<h2>Try it!</h2>
<p>Replace the <code>src</code> attribute of the <code>&lt;img&gt;</code>, and see it blur.</p>
<p>Modify the blur amount (between 0 and 5, float) in the JS to the far right.</p>

<img id="blur-me" src="" />
var img = document.getElementById('blur-me');

if(img.complete) {
  var newimg = Pixastic.process(
      amount: 0
/* The image I used here is only 128x128 natively, but with this blurring technique it could be used as a 1000x1000 background image! Here, I'm enlarging the image 2x its original size. Still looks good. */

img {
  width: 440px;

/* CSS below here is just presentational, for the demo. It's not relevant. */

body {
  color: #444;
  font-family: sans-serif;

h1, p, h2 {
  width: 51%;
  float: left;
  margin: 0 0 1em;

img {
  float: right;