A method includes: displaying a first interface; obtaining a brightness parameter; obtaining a first image stream, wherein the first image stream is an image stream of first color space; determining, based on the ambient brightness, to perform first target processing and/or second target processing on the first image stream to obtain a fifth image stream, wherein the first target processing comprises first image processing, the first image processing is used to convert the first image stream into second color space, the second target processing comprises second image processing and third image processing, the second image processing comprises downsampling and image enhancement, and the third image processing is used to convert an image stream obtained after the second image processing into the second color space; and displaying and/or storing the fifth image stream.