When Tokuso Hamai saw the colorized version of an old black-and-white photo of a picnic held under cherry tree blossoms sometime before World War II, forgotten memories of family members, most of whom died in the atomic bombing of Hiroshima in 1945, came pouring out. "In colorized photos, people come to life," said Hamai, now 86. "I often played near (the picnic site), and sometimes I would do some naughty things and get scolded by my father." The power of a colorized photo to reignite lost memories was eye-opening for Anju Niwata, the student who gave Hamai the colorized photo as a present three years ago. The 75th anniversary of the end of World War II is Saturday, and Niwata, now 18, said she hopes it will bring attention to her project with a Tokyo University professor to painstakingly colorize photos using artificial intelligence and their own research to spark lost memories for the rapidly aging generation who experienced the war.