Visual diff tool
In Artee Theme we use the Twenty Twenty plugin by Zurb: http://zurb.com/playground/twentytwenty It is realy awesome. You can use it if you need to highlight the differences between two images? This is some kind of a visual diff tool.
Usage is very simple. Just place your two images in the div container with 'twentytwenty-container' class.
<div class="twentytwenty-container"> <img src="/content/images/2014/Mar/1-2.jpg" alt=""> <img src="/content/images/2014/Mar/1c-1.jpg" alt=""> </div>