Digital 印刷에 있어서 color의 最適化에 關한 硏究

Abstract

In digital age, Printed matter the upgrade of the color printed matter is advanced with a multi kind small quantity production together quickly, and the demand of the consumer is more increased. Also most printing equipments about digital brazier lower the color which as customer demands for a color from place printing which many portions with automatic movement is managed and the actual printed matter which as nearly reappear are raising its head with the problem which is important. Especially, comparison of the printing method where the color civil official of the printed matter is different specially from domestic digital printing than with scientific and objectivity method the system device profile is applied at printing and the standardization of printing becomes accomplished, but as ever color difference of the manuscript and occurs is a possibility of knowing from specific color. Therefore, more for the system and efficient color civil official will be standardized and it is a necessary to confirm the objective data. From the research which it sees consequently there is to a digital printed matter and in order to control the color reappearance which is a most big variable in optimization properly from input device until output device it applies the color conversion method which is various in the color civil official as to minimize color difference of the manuscript and, it did to sleep, also it investigated the propriety of color conversion method. Generally the input and output devices are not reappeared with system independent color price, and data of system dependentcolor is reappeared with nonlinear conversion because of the output signal price against an input signal price from the color reappearance which in like this system quality depends and input device or the monitor the difference of hue occurs in the manuscript and last output scandal color. It reduces like this difference in order to the color reappearance method for the place where there is a possibility of sharing at three branch phase, First, all images always to show the answer back quality which is identical in quality of system, and calibration is phase. In after words, system dependent color space what finds out the color reappearance quality of color conversion system in system independent color space characterization is phase. It buys last from characteristic phase and position data and the conversion matrix it leads and it is done when and mathematics operation and the system independent color conversion become accomplished. The Color Management System (CMS) comes to be composed of like this three phases. To color conversion method of input device the method which uses a line-shaped conversion and the LUT which use the multiplex regression analysis law together, especially there is also the method which uses a spectral diffraction presumption is already executed. From the this study, In the method which is like this various accuracy to be high even in the sample color conversion the multiplex regression analysis law which is the possibility of doing quickly used. Also for a color conversion from the monitor with the GOG (gain-offset-gamma), the LUT (look up table) and the sRGB are general with the characterization model which is applied. So, It is like that it used this method together from the research which it sees and it tested, the GOG model where from in that the result is excellent in color conversion method of digital printing it applied. Also to color conversion method of the digital printer it used the LUT, 3dimension line-shaped interpolation laws and a tetrahedron interpolation laws. With after words, it is same like this test result it got a same conclusion. 1. The scanner which is a input device and the digital camera all CCD input sense but, by the input price of the manuscript which the scanner is accurate in base even color of the color conversion manuscript which uses a multiplex regression analysis and got the result where the scanner which it kicks is better the digital camera than. Also, Color of the scanner the lightness which it kicks, the chroma compared to it was added an extra weight in hue-angel difference and it appeared but, the digital camera all was added an extra weight in the lightness, the chroma and hue-angel difference and color difference occurred. 2. The GOG model even color difference it is a linear target from the average color conversion which applies the model appeared the CRT monitor fewer the LCD monitor than, case of IT 8.7/2 target the CRT appeared more highly the LCD and it got the result which is better than color conversion method of the sRGB and the 1D LUT. The GOG model in addition calculates the gain and a offset parametric variable in the gamma parametric variable which is a cause of relationship in non-liner shape from quality anger process with the possibility of raising an accuracy is in the monitor color civil official of digital printing is useful confirmed. In order to confirm the accuracy and an efficient characteristic of monitor color conversion method also political change exchange and adverse change exchange repetition result even color difference it accomplishes the CRT monitor compared to shows the result where the LCD monitor is better and it is used. 3. From the CMY which uses the LUT and 3 dimension line-shaped interpolations from the digital printer even color difference of the color conversion manuscript with the CIELAB and comparison got the result which is good with 1.311. Also, From the CIELAB which uses the LUT and tetrahedral interpolation laws with the CMY the color conversion manuscript and even colordifference from the CIELAB with the CMY color converting from the CMY color error occurred step phase interpolation converting than occurred plentifully with the CIELAB. 4. From color reappearance of digital printing case of monitor, The XYZ which it converts in multiplex regression analysis of input device it makes extreme to double an adverse change exchange matrix, it applies the reverse GOG model and after color converting the patch of the result most which buys color difference of the manuscript and shows color difference below 5 at monitor RGB price. Also, The XYZ which is transmitted from the case input device which is a printer it makes at LAB price to convert an extreme, when the LAB price which is converted calculating the CMY with the LUT and tetrahedral interpolations the color conversion which considers the black quantity was more accurate. Also, In order to minimize color difference of the manuscript and it shows the result where the relative rendering intent is most good from the color reverse thought which it applies.