The significance of color management is to make the output colors of various devices such as scanners, monitors, digital proofers, printing machines, etc. in the printing and copying process flow remain consistent. One of the important elements is the Icc color profile (unified color characteristic description file of the International Color Consortium). A complete Icc color profile should contain the characteristic description parameters of the correlation between the original color gamut space and the target color gamut space, such as different tone curves, gray axes, color tables, etc. for the device itself and for the operator. There are three different types of Icc color profiles for the different relationships between different color gamut spatial models. The first is the most important and the most used by us. It is the Icc color profile that describes the characteristics of the color gamut space of specific devices (such as RGB of the scanner, CMYK of the proofer, etc.). This Icc color profile is based on the device-independent color. Domain space feature description file. The second is the color characteristic description file associated with the device, which is based on two or more color gamut spaces, such as between two monitors, multiple monitors and printing equipment, etc. The difference between them and other software systems to complete the unified management of color. The third type is based on different color gamut spaces and even different standards. The associated color characteristic description file is also called PCS profile (profile connection space profiles), such as describing the color characteristics of the same device or different devices under different standard light source environments of D65 and D50. The following describes the application characteristics of Icc color profile in several types of conversion between different devices to explain its application in digital proofing color management.
At present, there are many color management software for digital proofing in China, but the principle of color management is basically the same. Let's take Blackmagic as an example to analyze the application characteristics of different conversion management methods for different devices. We know that the ultimate purpose of digital proofing is to achieve consistency between proofing and printed content and color, and the premise of realization is that the color gamut space of the proofer must be larger than the printed color gamut space, so that the matching of the two color gamut spaces can be achieved. Unite. There are four ways to convert the printer gamut space to the printing gamut space. The first is the sensation method. If the chromatic aberration is measured after proofing with this method, the Delta E is not necessarily the smallest, but the proofing of the human eye seems to be closer to the real printing, which caters to the human eye. Therefore, the overall color feels closer to printing, which is more suitable for proofing works of art or sample albums. The second is the absolute colorimetric method. If it is measured with a colorimeter, the proofing result Delta E achieved by this method will be smaller because it is converted based on the smallest measured color difference. During the processing process, it will print the paper and proof. Taking into account the color of the paper, even if there is a color difference between the two papers, it will balance the color difference of the paper through ink simulation to achieve the complete consistency of the proofing and the printing color. You can choose this method. The third is the relative colorimetric method. This method is very similar to the absolute colorimetric method, except that it does not take into account the paper color like the absolute colorimetric method, because the white point of the entire color gamut space has changed during the simulation of paper color. , The whole color space will be affected somewhat when it is converted, so it is safe to say that if the colors of printing paper and proofing paper are very close, then the color difference of proofing using the relative colorimetric method will be smaller than that of the absolute colorimetric method. The color is more accurate. The last one is the saturation method. If the sensory method is to reduce the difference in color in human vision, the saturation method is based on the sensory method and tends to bright and saturated colors. Because the color gamut space of the proofer is printed The compression of the color space makes certain color proofs that need to be exaggerated to be insufficiently saturated. For those who require printers to continue to exercise color control in pursuit of better printing results, the saturation method is the best choice, especially This method of color conversion is more needed for devices with relatively small gamut spaces. The above four conversion methods have their own characteristics and application objects, as long as they are properly selected and used, they should achieve the desired results.
It is the diversification of proofing requirements that makes color management have more application space. This is also true for digital proofing, as well as scanning equipment and display equipment. As long as you have excellent color management software and necessary hardware facilities, you can choose the right one. Application method to achieve color management in the printing process is not far away.
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