Back in the old days of the Soviet Union, people who fell out of favor with the Party bosses were airbrushed out of official photographs.
Tools and technologies change, but the urge to edit pictures is timeless. The latest example comes from Iran, where a photo of a missile launch appears to have been doctored to add a missile and perhaps erase one that failed to launch.
The thousand-word value of a fudged photo is debatable, but this comment from an NYT reader is priceless: "They probably used Gimp (not Photoshop) anyway...you can hide a weapons development plant, but you can't get away from Adobe that easily."
Below, a CIOI/Know It All exclusive artist's conception of the missing fourth missile: