Digital color proofing is a proofing technique that directly converts digital pages into color proofs. It does not require any intermediary media such as film or plates, and is an indispensable supporting technology for direct plate making. The traditional proofer proofing method can not meet the requirements of speed and efficiency in direct plate making, especially in the speed requirements of direct plate making; the simple proofing method using color separation film is no longer applicable, because direct platemaking has completely abolished the film. The use of, of course, will not specifically export film for proofing. There are two main applications for digital color proofing. One is the Imposition Proof for layout checking/internal correction, and the other is the Contract Proof for customers' signature printing. The former does not have strict requirements for color reproduction, but the latter has strict requirements for color reproduction and requires proofs to faithfully reproduce the effects of actual printing.
From the point of view of the color of the final proofs, digital color proofing is divided into Softcopy Proofing and Hardcopy Proofing. Soft proofing is the use of color display / screen proofing method, fast and cheap advantages. However, due to this proofing method, the principle of additive coloration is adopted, and the color gamut, observation conditions, physical appearance, and texture of the “sample proof†are far from the final prints using the color subtractive method, and it is difficult to achieve proofs. "Exactly in accordance with the print. The color display is exactly the same as the actual print, that is, the so-called "WYSIWYG: What You See Is What You Get" has very important significance. First of all, this is whether the soft proofing can be used as a necessary condition for the same sheet. In addition, basically all prepress processing is based on the fluorescent screen display. The operator decides the operation and adjustment needed according to the screen display effect. . If the screen display is too far from the target of WYSIWYG, the final result (print) is undoubtedly wrong.
In fact, WYSIWYG has always been a difficulty and focus in the development of digital color proofing technology and prepress technology. In recent years, with the continuous improvement of color management technology and screen quality and control technology, soft proofing has made considerable progress in technology, and the gap between proofs and printed products is gradually narrowing, which can basically detect the effect of prepress processing. , to predict the basis for the final printed product. "WYSIWYG" is gradually becoming a reality. At present, people propose a concept of using remote network proofing (ReMOTe PROOFInG). This is a proofing method based on a combination of network technology and digital proofing technology. A printing factory transmits digital proofs to the customer's terminal display through a network (for example, the Internet). The customer can confirm proofs and sign in his own office. Print the license. This will completely change the current pattern of proofing and build a new proofing method that adapts to the age of the Internet.
Hard-copy color proofing has made great strides, both in terms of color reproduction and material texture. It can be very close to the final print, or even completely "same." Color management technology plays a decisive role in the faithful reproduction of color, even if the colorants with different color characteristics can achieve the consistency between the proofs and the final print. At present, most hard copy proofing systems can set and control the density of solids, and can also simulate the actual printed imprinting characteristics (simulation of dot gain curve), which make up for the difference between the proofing imaging characteristics and the actual printing characteristics. Most high-quality digital color proofing systems can image on actual printed paper, avoiding the difference between proofs and prints due to different papers. The usual practice is to first image the medium on a special medium and then use a dedicated transfer device to transfer the dye image on the medium to the actual printed substrate (usually a thermal transfer method). Avoid the visual difference between proofs and prints due to the different materials of the substrate. This method is commonly referred to as digital color proofing of actual printed paper and has become a very important technical indicator for characterizing direct digital color proofing systems.
At present, the imaging techniques used for hard copy color digital proofing include dye thermal sublimation, color inkjet printing, color hot wax transfer, color silver salt photography, color photographic paper as imaging medium, and color electrostatic photography.
Among these techniques, dye sublimation is an excellent method, and ink jetting is also remarkable. The dye thermal sublimation method is characterized by high color purity, wide color gamut, and high color density. Moreover, most of these systems, especially high-end systems, are loaded with intelligent management techniques of color density control and simulation of dot expansion, making the proofs closer to reality. D. In addition, in order to eliminate the problem of inconsistency between the image receiving medium and the actual printed paper for dye sublimation, many high-end proofing systems can image the actual printed substrate, ensuring that the proofs are as consistent as the prints. The dye sublimation system is of high quality and enjoys the reputation of continuous proofing, but it requires the use of separate ribbons and image media, which brings inconvenience and certain difficulties to use and process control. It is generally suitable for proofs with a small format. (To be continued)
Digital color proofing (top)
February 10 11:06:34, 2024
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