What do the colors mean???

I think the app is good. I am not entirely sure as I do not know what the different colors represent and I have a number of files that look to be identical but show up and are colored a certain color even though I have "exclude identical items" checked off. So … this app may be great, but it is near impossible to tell when there is no clarification of what is going on. With clarification, Id give it 5 stars, but without, since I cannot tell if it actually works, how can I give it more than 3?

Ezeitgeist about Compare Folders