What's the difference between a photo and a hard photo?

There is no difference between the two. Hard photography is a professional photography term, which refers to plane photos taken for advertisements and magazines. The original meaning of portrait painting in China is to paint portraits of people. Portrait now refers to art photography, commonly known as art photo album, and also refers to photos. Nowadays, many commercial photography, as well as some photos that have to be superficial, empty and have no connotation, and have been seriously retouched for the sake of "flawless appearance", although also called taking pictures, have long run counter to the original intention of taking pictures.

Photo generally refers to indoor use, and the picture it outputs is generally only a few square meters in size. For example, small advertising pictures used by manufacturers at exhibitions. The output model such as HP5000 generally has a maximum width of1.5m. The media used by the photo machine are generally PP paper and lamps, and the ink is water-based ink.

Portrait, the original meaning in Chinese is to draw portraits of people, which is the traditional name of figure painting in China. Painting a portrait requires simplicity, so it is called a portrait. Du Fu's poem "Dan Qing presents General Cao": "The general is good at painting to cover the gods, and what he shows is not just the horse, but the life of a good man."