나노바나나 흑백 사진 컬러 복원 프롬프트 흑백 가족사진에 자연스러운 색 입히기

Colorize the attached black-and-white photo. Keep every face, expression, pose, the composition and all details exactly as they are; do not redraw, beautify or add anything. Use natural, realistic colors appropriate for [시대와 장소 (e.g. 1970s Korea)], with true-to-life skin tones and slightly muted film-era saturation. Known colors: [알고 있는 색 (e.g. mom's dress was pale yellow, the gate was green)]. Where the color is unknown, choose a neutral, believable color rather than a vivid one. Preserve the original grain and sharpness.