Bill, I think he was referring to using a lightbox to control the variation in lighting that was mentioned, not talking about the software, but I could be mistaken.
As you can see, there are many opinions. Most of those opinions (mine included) have a price tag attached. Photoshop is the Holy Grail, but it's also the Holy Grail in pricing as well. Photoshop Elements is the stripped down, retail version. There are many options out there, some free, some expensive. Almost every one of them has a 30 day free trial. Give them a shot and find the one that suits you and your budget and you'll be happy.
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Real name Steve but that name was taken on the forum. Used Middle name. Call me Steve or Scott, doesn't matter.