iStockphoto, the Getty Images "microstock" subsidiary that sells low-cost imagery and video, will announce Monday plans to raise prices and therefore photographer revenue next month along with a number of promotional activities.

The company sells credits that give customers rights to use contributors' photos in materials such as advertisements, Web sites or brochures. The higher the resolution, the more credits an image costs, and the credit cost will increase from $1.20 to $1.30 on August 19, said iStockphoto Executive Vice President Kelly Thompson. (Credits are cheaper in bulk.)

Because photographers get a proportion of the credit cost ranging between 20 percent and 40 percent, the increase will mean a few more pennies at least per sale for photographers, too. That may not sound like much, but some popular photos sell hundreds or even thousands of times over, so there are economies of scale at work here. Read more