Can I cut the photos of the photo contest?

Generally, the photos taken in photography competitions are allowed to be cropped, but as a photographer, the composition should be as good as possible before shooting, and too much cropping in the later stage will reduce the clarity of enlarged photos.

The proportions of the items you mentioned are different. There are many situations: First, the aspect ratio of various cameras is different. For example, cameras for 120 film are: 6×4.5, 6×6, 6×7, 6×9, 6× 17, Hasselblad X- 135 film.

Whether PS is allowed to modify the picture depends on what competition it participates in. It is strictly forbidden to modify the structure of the picture itself for participating in news and documentary photography competitions, but general adjustments such as adjusting the contrast of the picture are also allowed without affecting the authenticity of the picture. For art photography competitions, PS retouching or multi-picture synthesis is allowed, and even now there is a special computer creative photography competition.