The value of a Brad Pitt autographed photo is hard to gauge. In determining its value, the first step is to get the signature authenticated. If it is authenticated and certified, you can begin to get an idea of its value. To get a starting point, contact an auction house or a vendor specializing in movie collectibles. The experts there can provide you with a good range. After that, the best way to find its value is to put it up for auction. This can be done online, like on sites by eBay, through an auctioneer, or through ads – by saying the photo will go to whoever offers the best price.