What's the difference between digital proofing and printing proofing? How much do you charge? Urgent!

There are two kinds of digital proofing, one is traditional proofing, that is, film proofing, so that the color and effect will not be much different from printing, but the price is more expensive. The second type is digital fast printing in recent years, which is mainly aimed at short editions and variable printed matter in A3+ format. Fast speed, desirable standing posture, good effect and cheap price. Generally, it costs three or four yuan per side (not according to the bill, but the price will double if it is front and back). It is a face-to-face signing fee). Among them, the things printed by Fuji Xerox machine in Japan have a layer of silicone oil on the surface. If they are printed in four colors of black, they still have a concave-convex feeling. The color difference of each machine is different. Because the needs are different. If it is designed to see the effect, the latter is recommended. If it has been finalized and has not been changed, it is recommended to make a sample of the film. In this way, if it is not changed, the film can be printed directly to the printing factory. Hehe, I hope I can help you.