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What's the difference between inkjet printing, screen printing and photographing? What are light films and dumb films?
Printing: refers to a small area such as written documents or office documents. Ink painting: refers to the production of large billboards indoors and outdoors.
Portrait: refers to making high-pixel, high-definition pictures. Cover these documents with transparent film to protect them. Those that reflect light are called optical films/those that do not reflect light are called matte films.