How to print or print photos in a photo contest?

Color difference has nothing to do with printing. Printing needs color correction equipment, and printing (digital printing) will be carried out later if it is lewd.

Print it out better and the photos are too rough.

Mounting is not expensive, so you can take it to the printing shop for export and then take it to the gallery for mounting.

What I often see is a very simple one, a light beige border that won't take away the subject's field of vision.