표준인쇄를 기반으로 잉크 절감 솔루션을 고려한 인쇄 최적화

Abstract

According as the latest printing technology is converted from analogue to digital, life cycle of a printing technology is shortened and the existent printing companies were faced always in a new technology. Specially, way of foreign countries export opened because globalization of printing market is accelerated. But, printing buyers of advanced nation require standard printing process control. Therefore, strategic country standardization for global market correspondence and domestic market activation is required strongly. Also, printing industry was intensified competition by long-term stagnation of domestic market. Fall of printing price by this is gone fast. And require printing of high quality because eye-level of customer rises. Therefore, printing business is facing in difficulty more and more. One kind among subject that was marked out most greatly along with development of digital printing was GCR method in original file. Original file that is made in actuality GCR method that do not consider reappeared process finally causes various problem about interaction of ink and paper at actuality printing. For example, need a lot of researches about printing quality and ink use according as generate problem that is much by excess use of ink in case of printed because TIL(Total Ink Limit) is defined as 300% and applies file that apply low GCR curve to newspaper printing. Most basic description of Ink optimization replaces part that black ink been that reappear equal color is reappeared by C, M, Y in whole area of tonal range. Can reduce ink expenditure about 17 - 30% according to image. Also, color difference was less despite density change is great at printing. Could check on result that is shown color reappearance as original image in anonymous ranking test consisted of 11 specialists. Can reduce time that control color at printing. Also, can reduce fan-out or web growth that is often produced in web printing. And reappearance improved in some poor pint focus was seen. Could reduce printing dry time and decrease dryer energy in web printing of heat-set method. Gray balance was reappeared stably in image. According to printing environment, set off that generate much was improved. And Rosette Pattern decreased as is state that C, M, an Y ink quantity decrease.

In this study, Standard print environment was confirmed by applying the optimization process considering the domestic printing environment. and ICC color management based on improved algorithm is applied verification method and step-by-step from the input file to the final printout. the optimum K values ​​were evaluated in consequence of the value of Delta E ink savings and separations based on ICC profiles in standard print environment. metamerism was tested to confirm corrections under different light source. the efficiency of the optimization process was evaluated to be stability of print by changing the ink density the highest weighted factor on color reproduction. the results were as follows:

1. Colorimetric methods are able to analyze the accuracy of re-created file according to the solutions and GCG steps based on the ICC profile in prepress. Also, the changes in the error is same between the input files and the final printouts in a standard printing environment. Therefore, it is more efficient to check the input stage without checking the final stage.

2. The maximum amount of Ink saving solution is 24% under applied GRACol 2006 coated1v2 which has 27% of start K value as default. And when start K value is 0%, Ink saving amount is 32.62% with the same profile. At this time, Delta E of the reference value(GRACol2006 coated1v2)and Maximum value are 3.25 and 3.18 respectively. Almost no difference is detected. As a result, ink saving solution from 0% to start K is found that the maximum value applies on the standard printing environment.

3. Delta E is 3.93 in comparison of reference value(GRACo 2006_coated1v2) and original mean value in metamerism test for color reappearance confirmation in other light source. Delta E represented better result in solution maximum application by 2.86∼3.24 in maximum application of ink saving solution. Therefore, metamerism test is useful in domestic real condition that evaluate from F2 light source usually, and evaluates from D50 light source that is standard source at printing.

4. When print, Delta E of original and reference value(GRACol 2006_coated1v2) are each 2.62, 4.40 and each 2.44, 4.32 in ink saving solution application minimum and maximum value in bigger density tolerance ± 0.1 than condition that consider density tolerance ± 0.05 of ISO 12647-2, Delta E 5 lows in 2 printing stability test by ink density change that weighted value is the highest in color reappearance. Therefore, optimization process that apply basis standard printing from bigger ± 0.1 extents to value in tolerance extent fewer than Delta E 5 than density tolerance of ISO 12647-2 in printing stability test is more excellent in printing stability by density.

keyword: printing optimization, printing standards, GCR algorithm, TIL, ISO 12647-2, ink saving solutions