• 프린팅코리아
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• 제8권6호
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• pp.110-113
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• 2009

인쇄라는 과정은 다양한 분야로 구성되어 있으며 서로 다른 분야에서 어떤 작업이 이루어지는지 모르는 경우가 대부분이다. 가장 보편적인 출판을 위한 종이 인쇄 과정은 크게 디자인(Design), 프리프레스(Prepress), 프레스(Press), 포스트프레스(Postpress)로 구분할 수 있다. 인쇄 작업과 컴퓨터 기술이 결합하면서, 그 이전에 비하여 훨씬 다양한 색상을 구현할 수 있게 되었다. 하지만, 아직도 인쇄물에서 원하는 색상을 얻지 못하거나 색상 오차가 발생하는 경우가 종종 있다. 이런 사고가 어떤 원인에 의하여 발생하는지, 사고를 미연에 방지하기 위해서는 어떤 지식이 필요한지 알아보고자 한다.

• 방송공학회논문지
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• 제9권3호
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• pp.246-256
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• 2004

본 논문에서는 새로운 무손실 영상 압축 알고리즘을 제안한다. 무손실 영상 압축(Lossless Image Compression)은 Prepress Industry, Remote Sensing, Image archival system과 같이 정확성과 정밀도를 요하는 분야에서 사용된다 무손실 영상 압축은 원 영상와 복원 영상가 완전히 일치하여 품질을 그대로 유지할 수 있으나. 압축 효율 면에서는 만족할 만한 효과를 볼 수 없다. 기존의 대표적인 무손실 영상 압축 방법으로는 CALIC과 JPEG-LS이 있다. CALIC은 높은 압축률을 나타내지만, 3-PASS의 선처리과정을 요구하여 복잡도가 높아지는 단점이 있는 반면 JPEG-LS는 압축률에서 CALIC에 못 미치지만 복잡도가 낮아 부호화/복호화 과정이 빠르며 이 분야의 표준으로 지정되어 있다. 본 논문에서 제안한 영창 적응형 무손실 영상 압축기술은 다수의 예측기를 통해 현재 화소에 가장 적절한 오차값을 예측하였다. 또한, 산술 부호화(arithmetic coding)시 다수의 심볼 확률 모델을 사용함으로써, 단일 모델을 이용하는 방식에 비해 압축 효율을 향상시켰다. 다중 모델을 이용하는 방식은 본 논문에서 제안한 방식뿐만 아니라, 다른 무손실 영상 압축방법에도 그대로 적용이 가능하다. 실험 결과, JPEG-LS보다 약 5％의 압축 효율 향상이 있었다. 또한 CALIC과는 압축효율이 같거나 근소한 우위를 나타냈다.

• 한국인쇄학회지
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• 제25권2호
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• pp.29-44
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• 2007

The printing industry is getting more digitalized and integration. It has enabled the interactive information and networking from Pre-Press, Press, to the Post-Press. These are efficient management and the improved process and productivity are getting more important. Such trends improved in the functionality and automation. This paper tries to find out how technology for CIP3/4 -based process may be applied and resolved. Such subject includes the domestic and international cases regarding each manufacturer's CIP3/4 technology types. Another purpose is to emphasize on the needs to establish the environment. Under this environment, it is possible to integrate network in exchangeable form through JDF standard format after CIP3/4. Based on the data from this study, it is expected to collect further substantial data which is related to the domestic printing company's CIP 4 operation. It will be also possible to perform subsequent studies on the proper variables of the market segment. CIP4 stands for "International Cooperation for Integration of Prepress, Press and Post-press, it is an association of around forty international companies, mostly manufacturers of prepress, press and post-press, as well as suppliers and users. In this paper, we studied on the acting application of CIP4 work flow.

• 한국인쇄학회지
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• 제18권1호
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• pp.35-45
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• 2000

Recently, as the prepress mainstream is changed to the digital workflow, various digital proofing systems such as high price dye sublimation printers and low price ink jet printers are widely used in printing industry. However, most of the digital proofing devices have lower resolution than analog proofing systems and differ with actual color presses in the color gamuts. Therefore, proper color compensations are needed for digital color proofing in order to match colors between the proofs and the press sheets. This study shows the application method of Look-up Table to the digital color proofer of Rainbow, the analog proofer of Matchprint-II, and an actual offset press is effective on the color compensations.

• 한국인쇄학회:학술대회논문집
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• 한국인쇄학회 2000년도 추계 학술 발표회 논문집
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• pp.17-28
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• 2000

Recently, as the prepress mainstream is changed to the digital workflow, various digital proofing systems such as high price dye sublimation printers and low price ink jet printers are widely used in printing industry. However, most of the digital proofing devices have lower resolutions than analog proofing systems and differ with actual color presses in the color gamuts. Therefore, proper color compensations are needed for digital color proofing in order to match color between the proofs and the press sheets. In this paper, we used 3-dimensional look-up table(LUT) and tetrahedral interpolation method for the color space conversion between the device independent color space(CIEXYZ or Lab) and the device dependent color space(CMY) to reduce the color differences between the original copy and digital color proofs and the press sheets.

• 한국인쇄학회지
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• 제23권1호
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• pp.27-36
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• 2005

Most of flated scanners and digital cameras in prepress process utilize CCD technology. Device calibration and characterization process is needed to transform the device dependent color to the device independent color. ICC profiles for digital input devices encapsulated information relating the device values to CIELAB or CIEXYZ coordinates. The main purposes of this article is to evaluate some of the transformation methods based on ICC proposed device profiles and to propose optimal color transformation method for accurate color imaging in printing process.

• 한국인쇄학회지
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• 제23권1호
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• pp.53-63
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• 2005

The quality of the print can be specified through the quality of the coloring, the reproduction of fine structures and the range of tone values. Also, package printed quality are controlled by this points. In this paper, densitometry method was used for printed quality. By densitometry we can get the print density and the parameters of each conditions that characterize halftone printing, such as dot gain and relative printing contrast. Also, we have proposed the optimizes range of the parameters such as density, dot gain etc. to the package printed printability control.

• 한국인쇄학회지
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• 제23권1호
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• pp.13-25
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• 2005

In order to technical analysis of the Newspaper printing press, the printability such as, dot gain, contrast and printing density change according to the amount of ink and damping water feeding were experimented. t도 Printability assurance in printing aims at a correct and constant color reproduction throughout the whole print-run. And the checked values were checked from densitometer and colorimeter instead of conventional subjective method. In this research, we could propose the range of driving in printing of domestic Newspaper printing press as well as the limits of ink feed speed and damping water feed speed.

• 한국인쇄학회:학술대회논문집
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• 한국인쇄학회 2000년도 춘계 학술발표회 논문집
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• pp.45-55
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• 2000

Recently, as the prepress mainstream is changed to the digital wolkflow, various digital proofing systems such as high price dye sublimation printers and low price ink jet printers are widely used in printing industry. Generally, CRT monitors are also often used as a soft proofing device for hard-copy image output. However, displayed color image on CRT monitor does not match to the actual color printing sheets. Because, the color space of CRT monitor used RGB color space, and it is differ with printing device color space, CMY. Therefore, proper color compensations are needed to match the colors between hard-copy proofs on the printing device and soft copy proofs on the monitor. For the proper compensation, we used LUT and gamut mapping method for color space transformation between device dependent color space and device independent color space, vis a vis. This paper shows the application method and the usefulness of CRT monitor for the soft-copy proofing using the output characteristics of printing device.

• 한국인쇄학회지
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• 제18권2호
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• pp.69-82
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• 2000

Recently, as the prepress mainstream is changed to the digital workflow, various digital proofing systems such as high price dye sublimation printers and low price ink jet printers are widely used in printing industry. CRT monitors are also often used as a soft proofing device. However, it is very difficult to match the color image displayed on CRT monitors to the actual images printed on papers, because the color space of CRT monitors is RGB color system, and it is different with the CMY color system of the printing devices. Therefore, proper color compensations are needed to match the colors between hard-copy proofs on the printing device and soft copy proofs on CRT monitors. This paper shows the LUT and gamut mapping method considering the printing characteristics of output device is useful for the compensation.