I like the way the images are preloaded on the website of the guardin, for instance in this case : http://www.theguardian.com/artanddesign/gallery/2014/dec/08/photographer-of-the-year-2014-shortlist
They are first of all blurred/pixelized and then loaded. I would like to apply something like this for a website I'm actually doing, which has quite heavy images. All my images are already placed on the website.
Any idea of how is this made ? Any plugin maybe ?
Thanks a lot !