The digital color management of packaging and printing paper industry is more compact and perfect.
calendar printing, poster printing, couplet printing and printing is a graphic communication industry. In the image and graphic part, it has now moved towards colorization. Even a large part of the newspaper is color. Therefore, image reproducibility and color reproducibility play an important role in quality. Coupled with the packaging of many products, the image and the color of the ground color are the basis for many customers to distinguish the authenticity
I. today, the division of labor in printing and surrounding industries is becoming increasingly dense. Driven by electronic digital technology, hardware and software can be measured, simulated and controlled more accurately. Therefore, print users have increasingly strict requirements on the color reproduction diversity of printed products. Some are even more demanding, not only beyond the visual recognition ability, but also use instruments to measure and detect the dark and dark parts. The error value that is insensitive to human eyes exceeds the necessary measurement requirements, and loses the required scope of visual products
II. Color management has changed from blocked to open. From the 1970s to 1980s, electronic scanning color separation machines were installed. Technicians will require the output of test color films, printing and proofing, so as to establish the blocked color reproduction gamut and color balance system of the printing plant. If there are different printing papers, color reproduction management is also divided into three curves: bright copper plate, fog copper plate and uncoated. The author asked him what if the plate making factory should respond to many different printing factories? He can't cope with them one by one, but only achieve the color management system until the proofer prints out the samples. Today, carpet ostriches no longer rely on the concentration value of R, G and B three-color filters for color management, because it cannot calculate the color difference value, but mostly use lab solid color. Instead, they should focus on the upper domain space of the above two types of construction machinery, the L color brightness value and the hue plane position of AB and - a-b. when it is the data of color value, the two color data, whether RGB to CMYK, RGB to different RGB performance, CMYK to RGB The change value from CMYK to different CMYK output performance can be calculated by using the color gamut space of lab. Moreover, the difference between two colors (secai) can also be used to display the color difference of plane or three-dimensional gap with the value of △ e, so the open prepress and printing facilities using this color gamut space have become the mainstream of color management. Under different brand facilities, different hardware, software colorants and media combinations, the display and difference adjustment of color values can be done. Today's ISO system also uses lab data values, To be the main body of color specification and operation, so that color reproduction can be more open and consistent
III. image input, shielded display and various output management the traditional image input center has been used by professional roller or platform CCD scanners with good it87-17-4 for transmission and zuotousheji color correction to capture image documents. But today, it has become an ordinary amateur CCD camera, and even the image files taken by the camera are reproduced under different hardware CCD and software file shifting and color mechanism. Coupled with the changes in the lighting color temperature of the environment, today, there is no money and time for many prepress work, and there is no manual common sense color and tone adjustment work. Therefore, if today's many prints are not taken by the studio, there are color managers, Most of them are image images with a large gap between version and color. When using a small number of diverse version free printing in the future, the situation will be worse and more serious. Therefore, Ai Ai image trimming software is necessary. As for the color reproduction of the screen, it is more important to promote the soft proofing and paperless printing of the remote screen (zai4xian4 yin1wei4xian4tui1dong4yuan3ju4ping4mu4). Some advanced screens have automatic color correction facilities and procedures, or color management software, so that the dosage measuring instrument can do the correction of screen color output effectively. However, different screens have different color gamut performance. For example, CRT use (shiyongg) arranges the employment of 1500 people, the color rendering of cathode ray tubes (with a big machine on the back), the use of electronic rays to stimulate the luminescence of fluorescent toner, and the thin LCD lcdtft screen, using backlight to emit white light, and then using filters to produce color, are quite different, and the color rendering of 53lcd backlight module itself is also inconsistent
basically, the color rendering performance of the screen is broader than that of the printed matter, but it does not mean consistency and long-term stability. Even after the power is turned on, the color will be stable only after 10 to 20 minutes. In addition, human vision determines that the color has harsh sensory optic nerve and visual compensation changes. For example, after a while in the dark to the bright, the user will return to using the data collection card to collect and output the real-time data of the experimental machine, and the dark will feel darker, which will be adjusted later. This is what users must pay attention to and understand. As for output, it has long been the main goal of printing output. Color reproduction includes plate making process, plate material conditions, printing machine conditions, printing ink conditions, paper medium conditions, lithography and ink balance conditions, temperature and humidity conditions, printing pressure and other conditions, which integrate the printing tone and color reproduction conditions. The biggest pillar of color management is the stability and consistency of these conditions as the cornerstone, Otherwise, there are fierce and changeable reasons in its own conditions, then all information colors
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