Proofing method of printing proofing

Machinery is also called analog proofing. Generally speaking, under the same printing conditions (such as paper, ink, printing methods, etc. ), install the printing plate made of the manuscript on the prototype (see Figure 4-27), and print it to obtain samples, then check it against the manuscript or layout design pattern until the tone, color, text and layout specifications are correct, and finally sign it by the customer to print.

Although mechanical proofing is carried out through simulated printing, the ink transfer principle, printing materials and printing environment used in mechanical proofing are often inconsistent with actual printing. Therefore, the color and reproducibility of the proofs obtained from the proofing machine are always different from those obtained from the printing machine. In order to reduce this difference, multi-color automatic proofing machine has been developed and applied to printing production. Pre-proofing Pre-proofing, in the absence of printing plate, paper, ink and proofing machine, using special photosensitive materials and applying optical and photochemical principles, obtains color samples or displays them on the display screen, finds the problems existing in image information processing, corrects them in time, and improves the efficiency of mechanical proofing. (a) photosensitive material proofing method This method includes color film stacking method, color stacking method and electrostatic proofing method. Generally, the photosensitive material is coated on the film base, and then it is closely attached to the corresponding color separation and screening film for exposure, making monochrome yellow, magenta, cyan and black films, which are superimposed together to form a color image. In this way, the colored layer of each monochrome sheet is transferred to the proofing substrate to form a color sample. (2) Computer-aided proofing method This method includes soft proofing and hard proofing. Soft proofing, using computer-aided color proofing system, you can see color images on the display screen, but you can't get samples. Hard proofing, using the data output by the color imposition system, obtains the proofs on the hard proofing system. Hard proofing system generally consists of display terminal, keyboard, floppy disk drive device, laser recording system and online photo developer. You can also use the data of the full-page imposition machine to obtain proofs through a color inkjet printer. (3) Electronic proofing, a proofing method, is mainly adapted to the increasingly developed desktop publishing, and the proofs are obtained by sublimation with ink jet printers or thermal dyes. Inkjet printer, the print head is equipped with a very thin nozzle, which is used to spray ink onto paper. There are four print heads, three print heads and one print head. In thermal dye sublimation, a plurality of thermal sensors are installed on the print head, which melt the transparent dye on the ribbon onto the paper, and each color covers each other and overlaps into a color image that looks like a photo.