ROCHESTER — Steven J. Sasson, an electrical engineer who invented the first digital camera at Eastman Kodak in the 1970s, remembers well management’s dismay at his feat.

“My prototype was big as a toaster, but the technical people loved it,” Mr. Sasson said. “But it was filmless photography, so management’s reaction was, ‘that’s cute — but don’t tell anyone about it.’ ”