Are those photos taken by American Professional Photographers Association (ppa) simple or post-processed?

There is an unwritten rule in PPA or foreign photography circles.

News documentaries can only be edited and cannot be edited to form other meanings.

Nature and portraits of non-commercial films can be processed in darkroom, but the photos themselves cannot be changed, the film content cannot be modified, and new intentions cannot be formed after cutting.

The national geographic expedition needs the original film.