30% in the early stage of photography, 30% in the late stage, and 40% in magnification. What does this sentence mean?

That is to say, 30% of the effort of a successful photo is the preparation before shooting (equipment, lighting, scene selection, model, clothing, makeup, etc. ), 30% of the effort is the photographer's own photography skills (exposure control, scene composition, depth of field selection, etc. ), and 40% of the efforts are post-photo and drawing operations (post-color matching, stitching special effects, washing, enlarging and printing).

Of course, this is someone's opinion, because different photographers have different focuses according to their personal habits, and there is no unified view.

From this sentence alone, we can infer that this photographer.

I think it's a shed photographer.

It should be a film photographer (film needs to enlarge the negative to the required size, which involves technical activities such as secondary focusing and secondary exposure, and digital photography no longer needs a magnifying glass)

The whole process control shows that the photographer has a good team, not a person.