In the 1960s, Jerry Uelsmann revolutionized the art of photography by manually blending negatives to produce dreamlike landscapes. “The primary creative gesture for most photographers used to be when they clicked the shutter,” Uelsmann says. “But I realized that the darkroom was a visual research lab where the creative process could continue.” Though we’re now in the era of Photoshop, he continues to forsake digital manipulation, as with the 2006 untitled image made from three photos, one including his wife’s hands. “It is an incredible leap of faith to think maybe this tree could blend into these hands,” Uelsmann says. “But the camera is a license to explore.” Uelsmann’s creations are showcased in a traveling exhibit, “Faking It: Manipulated Photography Before Photoshop,” at the National Gallery of Art through May 5.