The significance of color management lies in the consistency of the output colors of various devices such as scanners, monitors, digital proofers, and printers in the process of printing and copying. One of the important elements is the Icc color profile. A complete Icc color profile should contain parameters describing the nature of the correlation between the primary color space and the destination color space, such as the device itself and the relative operator's different tone curves, gray axes, and color tables. There are three different types of Icc color profiles for different relationships between different color space models. The first one is the most important and the most used one. It is the Icc color profile that describes the characteristics of a specific device's color space (such as scanner's RGB, proofer's CMYK, etc.). This Icc color profile is based on device-independent color. Domain feature descriptors. The second type is a device-associated color profile, which is based on two or more color gamut spaces, such as between two monitors, between multiple displays and printing devices, etc. It is intended to describe equipment and equipment. The difference between them and then with other software systems to complete the unified management of color. The third type is based on different color gamut space or even different standards associated color profiles described in the PCS profile (profile connection space profiles), such as described in D65 and D50 different standard light source environment under the same device or different device color characteristics. The following describes the application features of the Icc color profile in digital proofing color management according to several conversion methods between different devices.
At present, there are many color management softwares used for digital proofing in China. However, the principles of color management are basically the same. We use Blackmagic as an example to analyze the application characteristics of different conversion management methods for different devices. We know that the ultimate goal of digital proofing is to achieve the consistency of proofing and printing content and color, and the prerequisite for realization is that the color space of the proofer must be larger than the color space of the printing, so that the matching of the two color spaces can be realized. Unite. There are four ways to convert the printer gamut space to the printing gamut space. The first is the sensory method. If you use this method to measure the color difference after proofing, the Delta E is not necessarily the smallest, but the impression on the human eye seems to be closer to the actual printing. It caters to the feeling of the human eye. Therefore, the effect is closer to printing on the overall color. This method is more suitable for proofs such as artwork or sample albums. The second is the absolute colorimetric method. If the colorimeter is used to measure the results, the Delta E will be smaller because it is based on the smallest measurement color difference. During processing, it will print paper and proofing. Taking into account the color of the paper, even if there is a color difference between the two papers, it will balance the paper color difference through the ink simulation to achieve the exact matching of the proof and the printing color, for the strict requirements of the packaging printing proofing and some proofs involving spot colors. You can choose this method. Again, the relative colorimetric method, which is very similar to the absolute colorimetric method, except that it does not take into account the paper color as the absolute colorimetric method, because the white point of the entire color gamut space changes during the simulation of the paper color process. The whole color space conversion will be somewhat affected, so it can be said that if the printing paper and proofing paper color are very close, then the relative colorimetry method will achieve a smaller sample color difference than the absolute colorimetric method. The color is more accurate. The last method is the saturation method. If the sensory method is to reduce the color difference in the human visual sense, then the saturation law tends to brighten and saturate the color on the basis of the sensory method, due to the color space of the proofer. The compression of the color space makes certain color impressions that need to be exaggerated to be insufficiently saturated. Saturation is the best choice for those who require the printer to continue to use color control in pursuit of better printing results. This method of color conversion is more needed for devices with a relatively small sample gamut space. The above four conversion methods have their own characteristics and application objects, as long as a reasonable choice of use should be able to achieve the desired expected results.
It is the diversification of proofing requirements that makes the color management must have more application space, digital proofing is so, scanning equipment, display equipment and so on, as long as they have excellent color management software and the necessary hardware facilities and then choose the right The application of the method to achieve color management in the printing process is not far away.
Source: Ke Yin Network
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