Photoshop blogger Helen Bradley (who we refer to quite a bit around here) explains how to set up Photoshop to keep a more detailed record than just the basic history feature, which doesn’t show many details. You can choose to store information either with an image or in a separate text file (the latter would be easier to share with others). Hit the post for the full set of steps. If Photoshop is too complex (or expensive) for your needs, check out the five best image editing tools.
Photoshop – keep a log of everything you’ve done [Projectwoman]