A few days ago I wrote a script to get the relative difference between two sets of data.   When this comes to images we can detect all sorts of things, more accurately.   Take for example you have two images with different lighting.   http://prodynamics.co/link.php?CMD=file&ID=compare1 (1600x976) http://prodynamics.co/link.php?CMD=file&ID=compare2 (1600x976)   (These are both jpg images, their format is stored in the database)   You will notice that the second image is conside