The recent discovery that a Lebanese freelance photographer, Adnan Hajj, had manipulated pictures he took for Reuters has raised questions about the standards of photojournalism at a time of widespread digital photography. The case also increased pressure on news photo editors, who select and edit thousands of photographs under deadline pressure each day, to detect digital alterations. "The Soviets had to have a whole department to doctor pictures," said David Friend, an editor at Vanity Fair and a former director of photography for Life magazine. "Now all it takes is a swipe of a mouse, and the kid down the...