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 profile. A complete Icc profile should contain parameters describing the nature of the association between the primary color space and the destination color space, such as different tone curves, gray balances, and color tables for the device itself and for the operator. There are three different types of Icc profiles for different relationships between different color space models. The first is the most important and the most widely used one. It is the Icc profile that describes the gamut space of a specific device (such as scanner's RGB, proofer's (CMYK, etc.) characteristics. This Icc profile is based on device independent color gamut. Spatial characterization file.
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 profile, also called PCS profile (profile connection space Drofiles), as described in the D65 and D50 different standard light source environment under the same device or different device color characteristics. The following describes the application features of Icc Drofile in digital proofing color management according to several conversion methods between different devices.
At present, there are many color management softwares for digital proofing in China, but the principles are much the same. Taking Blackmagic as an example, we 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 proofing machine must be larger than the color space of the printing so that the matching of 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 the chromatic aberration is measured after proofing with this method, E is not necessarily the minimum. But in the sense of the human eye, the proofing seems to be closer to the actual printing. It caters to the feeling of the human eye, so the effect is closer to the printing on the overall color. This method is more suitable for the proofing of works of art or sample albums. . Followed by the absolute colorimetric method, if the colorimeter measurement, this method will achieve a smaller sample E results.
Because it is based on the smallest measured chromatic aberration, it will take into account the color of the printing paper and the proofing 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 Proofing is exactly the same as the printing color. This method can be selected for strictly required packaging and printing proofing, as well as some proofs involving spot colors. 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 entire color space conversion will be somewhat affected. Therefore, it can be said that if the printing paper and the proofing paper are of similar colors, the color difference obtained by using the relative colorimetry method will be smaller and the color will be more accurate than the absolute colorimetry. The last one is the saturation method. If the sensation method is to reduce the color difference in the human visual sense, then the saturation law tends to brighten and saturate the color based on the perception method.
Due to the compression of the color space of the proofer to the printed color space, some color proofs that need to be exaggerated are not saturated enough. Saturation is the best choice for those who require the printer to continue to use color control to pursue better printing results, especially for devices with a relatively small sample gamut space. method. 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.
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 profile, also called PCS profile (profile connection space Drofiles), as described in the D65 and D50 different standard light source environment under the same device or different device color characteristics. The following describes the application features of Icc Drofile in digital proofing color management according to several conversion methods between different devices.
At present, there are many color management softwares for digital proofing in China, but the principles are much the same. Taking Blackmagic as an example, we 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 proofing machine must be larger than the color space of the printing so that the matching of 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 the chromatic aberration is measured after proofing with this method, E is not necessarily the minimum. But in the sense of the human eye, the proofing seems to be closer to the actual printing. It caters to the feeling of the human eye, so the effect is closer to the printing on the overall color. This method is more suitable for the proofing of works of art or sample albums. . Followed by the absolute colorimetric method, if the colorimeter measurement, this method will achieve a smaller sample E results.
Because it is based on the smallest measured chromatic aberration, it will take into account the color of the printing paper and the proofing 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 Proofing is exactly the same as the printing color. This method can be selected for strictly required packaging and printing proofing, as well as some proofs involving spot colors. 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 entire color space conversion will be somewhat affected. Therefore, it can be said that if the printing paper and the proofing paper are of similar colors, the color difference obtained by using the relative colorimetry method will be smaller and the color will be more accurate than the absolute colorimetry. The last one is the saturation method. If the sensation method is to reduce the color difference in the human visual sense, then the saturation law tends to brighten and saturate the color based on the perception method.
Due to the compression of the color space of the proofer to the printed color space, some color proofs that need to be exaggerated are not saturated enough. Saturation is the best choice for those who require the printer to continue to use color control to pursue better printing results, especially for devices with a relatively small sample gamut space. method. 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.
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