The proofing machine is a kind of analog printing, checking whether the plateau tone and the color tone can achieve a good synthetic reproduction, and the well will copy and reproduce the error and the data standard that should be achieved, and provide it to the plate making plate as a basis for trimming or re-plate making, and at the same time, for printing. The ink color, ink density and dot gain data provide reference proofs and are proofreading proofs.
Various proofing machines of different methods and data effects have their own strengths, and they play different roles in the transition to standardized electronic color separation printing engineering. Various photosensitive coloring imaging proofing
The proofing machine utilizes the different sensitivities of various materials of glazing materials, and performs image transfer through the exposure of the original image of the color separation screen, and then produces a single color map of three primary colors represented by dyes, pigments, inks or toners, and then overlaps , lamination, I transfer overprinting, etc., to achieve color mixing to reproduce color images.
These proofing methods are easy to operate, fast and stable, bright and colorful, and high in image reproduction quality. However, due to the difference in the chromaticity characteristics of the dye or pigment of the proofing machine and the printing ink, and the difference between the actual printing dot enlargement and the change of the ink layer data is large, the specification data of the actual printing change cannot be completely simulated. At present, it is not completely possible to replace machine proofing. As a means of testing color plate making, it has certain use and reference value. If the normative data of the plate-making printing reaches a very stable standard, the plate-making and printing establish a stable data correspondence relationship with the proofing, and the proofing method can obtain the actual use value.
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