Third, the digital proofing point Printing companies and their customers in the transfer process from analog to digital workflow, the digital proofing this link has not yet reached a free situation, because this change is not easy, or even difficult, and therefore need time. The press operator needs time to learn how to match the print results with the results of the proofing, rather than using the dot-to-point analogy as before. Note that it is important to match the printed colors with the results of the proofing rather than using a magnifying glass to check the proximity of the printed dots to the proofing dots. This change in mind is a prerequisite for accepting the digital proofing process. In order to check whether the print color matches the color of the proofs, it is first necessary to observe under the standard light source. For the prints with low quality requirements, visual inspections can be used; however, for those with high quality requirements for printed matter, instrument inspections are required. A typical densitometer can only measure optical density. When the demand is high, a spectrodensitometer or similar device can be used to measure the actual color values ​​of proofs and prints.
Fourth, digital proofing technology There are two types of digital color proofing methods, one is half-tone proofing, the other is continuous proofing proofing, these two proofing each have a lot of technology to achieve, such as laser dye removal (Laser Dye Removal ) Technology, color inkjet replication technology, dye thermal sublimation technology, laser color printing technology, and thermal transfer replication technology. Each digital proofing technology has its advantages and disadvantages, and the prices of equipment and consumables may vary greatly. But as long as proper management and calibration are performed, each digital proofing technology produces a very accurate color.
When discussing digital proofing techniques, it is not possible to consider only the advantages and disadvantages of various color proofing techniques. It is also necessary to judge every proofing technique from an economic perspective. For example, inkjet replication technology and dye thermal sublimation technology can produce very accurate color proofing, but the cost of the two is different. Therefore, finding the right digital proofing method for each customer is not a simple matter, because the customer's requirements and preferences are varied.
V. Page Proofing and Layout Proofing Color proofing is of course important. Page proofing and imposition proofing should occupy equally important positions. The purpose of page proofing is to check the fonts, linework and layout. This kind of proofing should begin early in the production cycle. If the user equipment has the ability to combine page proofing and color proofing, the page proofing can be combined with the color proofing, but the two should be independent and can be clearly distinguished from each other.
The transfer of prepress preparation results to large format output also requires some type of imposition proofing system and a system that calibrates color proofing equipment. The operator must confirm that the pages of each publication have been placed in accordance with the requirements of the book, and that the page numbers have been rationally imposed according to folds and saddle stitching. The equipment used for proofing the layout results is usually a large-format inkjet printer, such as the Atlas produced by Agfa, which is a continuous drum proofing device. If Apogee workflow software developed by Agfa Corporation is purchased, its RIP and output management module Print Drive support special preview function, which can carefully check the job to be output before outputting.
Layout proofing is to check the correctness of the operation as a whole. If the layout of the layout is not reasonable, the printing and binding workshop will be at a loss. Therefore, the prepress and platemaking departments should have regular communication with the printing and binding workshops. Understanding each other is the fundamental method to prevent rework.