Discussion on color printing digital quality control technology
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In some traditional printing methods, the generally consistent printing factory has a roller scanner to perform characterization correction according to the printing equipment at the back end, and then uses some color control inverted table as a tool to correct his characterization curve. A looping color monitor.
When we are doing the color monitoring program, we can use some guides to match the visual judgment of the human eye as a reference indicator for correcting some color deviations. However, because Taiwan still does not have a set of quality control indicators with fair standards, the printing practitioners do not have a set of reference standards and are at a loss.
From the trend of continuous growth of US printing equipment since the 1990s, the total demand for printing equipment is maintained at more than US$400 million per year until around 2000. This represents the growing demand for printing equipment, and the number of other printing presses ( A print volume of more than 24 pages per minute) also shows a trend of growth.
Most people think that a color can't be recognized without actually seeing it. It must be "seeing it as a basis" to believe it, but can people's eyes really believe it? The human eye judges the color according to the +R, G, B sensing cells in the eye to sense the color, but in the dimly lit environment, the cells can not function normally, often producing unpredictable color error. In the printing house, the printing master often judges a special color formula with his own eyes, and thinks that the colors are similar and directly printed on the machine. There are many disadvantages in this way:
1. Wasting time
2. The color that is blended in a dimly lit environment is very different from the actual color.
3. Wasting money
People's eyes often cause eye color error due to the influence of some surrounding environment, so we must use some quality control tools to help us determine the color and establish the standard of quality control.
In the communication of colors, each country has a color system developed by them, such as the Munsell eye color system in the United States, the Ostwald in Germany, and the color rendering system in the Japanese color research. The standards of various countries have caused difficulties in color communication, so It is necessary to unify the naming of colors, and it is necessary to pay attention to the color matching. It is necessary to have a coordination and consistency.
In addition to the commonly used concentration meter and colorimeter in the auxiliary tube tool of the human eye, there is also a spectroscopic spectrometer that can measure the characteristics of the illuminating object, and he can correct the screen, or measure the standard color disc, etc., inside it. There is a laser ball, he can measure the spectral curve of the color ticket, but because of its higher price, it is less suitable for Taiwanese printing plants.
The use of digital cameras is becoming more common, but because each digital camera has its own individual differences, in order to calibrate each digital camera, scientists use the "digital color wheel" to create a unique profile for the digital camera, correcting the camera and The difference in RGB signals between human eyes.
Once the screen has been calibrated and characterized, it can also generate an ICC profile, but there must be a prerequisite that you must have a colorimeter as a quality control tool for the human eye. When we are doing the screen color, we must reduce the influence of the surrounding light source, turn off the light source, and make adjustments in the dark environment to avoid affecting the accuracy of the screen correction. The prevalence of the Internet has caused people to be different. Places, through the same screen to see the same color, in order to achieve such a purpose, the remote screen must be corrected to the same level, in order to achieve the color management purposes of CMS.
The theory of print reproduction has the distinction between concentration and colorimetry. Most people in color management pay attention to the theory of colorimetry, but concentration is the basic.
Digital workflow is a new way for printers to increase production capacity. Only by working hard in the digital production process can the printing company improve its competitiveness.
The application of quality control tools is because the human eye judges that the color is too subjective and lacks an objective measurement standard. Therefore, the quality control tool is needed as a basis for supporting the human eye as a color judgment. Many use quality control tools, don't believe too much. your eyes
In response to the prevalence of the Internet, all printing production may become a process of viewing on the screen, so the printing of soft proofing becomes very important, and the correction of the screen is relatively necessary.