How to implement color management
How to implement color management
In the color image reproduction, they must be from the scan, display, output to print color uniformity, we must implement a standardized, data-based color management. The so-called standardization, is the product in the production process using standard raw materials, equipment, standard conditions of production, standard data production, standardization refers to the production process according to a certain procedural norms of construction, the data center of the standard and norms to be performed by operational quantitative indicators, all data values can be said that the three complement each other, the integrity of science combine to achieve mass production, the stability and improve product quality purposes. Color management includes: 1, color matching between input devices. 2, original colors and color matching between display. 3, the output color matching between devices. 4, the display between color and print color matching. 5, the original manuscript and the printed color match between the. Color management is to solve a variety of devices matching the color conversion. First of all, the establishment of environmental standards standard color light source, standard light source the core components should have a higher color temperature and a high color-rendering index, the International Standards Commission on Illumination (CIE) and the National Printing Industry standards require that observations reflect the standard light source color temperature proofs 5000K, 6500K, color rendering index is usually “95%. 5000K is a CPM (mini) transmission standard light source; using a standard light source of the proofs, while observing demand constant indoor light. Second, the selection and device-independent color space (CIE, LAB), according to color theory, color can be any kind of white colored light source of three colors R, G, B match it, but the proportion of three primary colors is not the only; any kind of neutral Gray can be mind-color pigment three sources C, M, Y match up. However, due to incomplete absorption of light and pigment, to achieve the desired neutral gray and to meet the actual printing of the results, we must use Black Ink to make up. Is this the same blocks of color with a different device performance, resulting C, M, Y, K the ratio is different. For example, a blocks of color print is reproduced using CMYK ink Tianjin, the ratio of 64%, 36%, 8%, 10%, with the ink-jet printer reproduced the ratio of 60%, 30%, 10%, 10%, indicating The physical quantities describing the same color CMYK and equipment and material. If using CIE L * a * b * to read these blocks of color printing is necessary to ensure that the CIE L * a * b * values (70,40, -12), and inkjet proofing when the CIE L * a * b * values (70,40, -12) the same, then the visual appearance of the color is consistent, which shows CIE L * a * b * is device-independent, independent of the physical quantities describing colors. CIE L * a * b * color space, color gamut is far greater than any other device-related color space, thus the conversion in the color mapping process does not damage in the base color space, color gamut range. Color management is the use of independent and device-independent physical quantities CIE L * a * b *, to communicate and calculate the original color, screen color and print color in the color space corresponding relationship to achieve the same visual color to achieve different devices and color conversion. Color conversion is the color in different color space conversion. Through the L * a * b * color space, as is the transition between the color space and color among the various devices can complete the conversion, but also the equipment and devices convert the relationship between the infinite combination of equipment into space and the standard color space between the 55 corresponds to the relationship, greatly simplifying the complexity of the matching transformation. Then, describe the equipment to establish the characteristics of the color document (Profile), to reflect the range of device performance and characteristics of color, using the signature file can be completed the device color space and L * a * b * color space mapping between the body conversion. Color management process using the following structure to complete the color conversion of such cross-platform and systems delivery uniformity