7yuv handles any file as raw binary, i.e. there are no hidden data alterations such as line-ending conversions in text files. This allows to analyse binary data in its true representation.
This makes 7yuv a valuable tool for binary data verification: You can load the output of your program, video codec, 3D shader, etc., look at it on graphics or byte level and verify against the expected output.
In particular for the graphics mode, no hidden format conversion is taking place. A file will be interpreted as defined by the graphics format settings: color format, width, height, linestride (Raw Image Data Model). No matter what format the underlying file actually is, 7yuv will show it as defined by the format settings.