Can the photos of the photo contest be processed in black and white or nostalgic technology?

It depends on the specific requirements of the organizers of the photo contest, and there are generally detailed requirements.

General photographic works are divided into:

A, record photography. This kind of work must be a true reflection of objective reality, and the content of the picture cannot be added or deleted except the original picture. Color photos can be converted into black and white photos as a whole, but they cannot be converted into colors locally; Tone and color can be adjusted appropriately without violating the objective properties of the subject.

B, artistic photography. This kind of work must be a true reflection of the objective scene, and the content of the picture can not be added or deleted except the original picture. Color photos can be converted into black and white photos as a whole, but they cannot be converted into colors locally; Tone and color can be adjusted appropriately without violating the objective properties of the subject.

C. commercial photography: this kind of work mainly reflects objective objects, and the image can be adjusted to a large extent.

I hope my answer is helpful to you.