The sunset colors were reproduced photographically with perfect accuracy, just as seen by the naked eye.

photographically 是由名词 photograph（照片）加上形容词后缀 -ic 变成形容词 photographic（摄影的、照相的），再加上副词后缀 -ally 构成的副词形式，表示"以摄影的方式"或"在摄影方面"。