數位樣張與印刷品的同色異譜現象分析與診斷之研究

The Research and Analysis on Metamerism with Direct Digital Color Proofing and Printing

鄭博中(Po-Chung Cheng) ； 賀秋白(Chiu-Pai Ho)

《中華印刷科技年報》 2015 (2015/06) Pp. 295-319

摘要

同色異譜現象為判斷印刷品質的重要因素之一，主要受到被印材，油墨，以及標準光源的影響。標準光源為針對印刷品在視覺評估上所訂定的標準，以判斷相同的印刷品在其標準光源下，能否達到最佳的品質表現，以及是否產生色差，色偏等現象，為印刷業者油墨調整的依據，在平版印刷上以標準光源D50為標準。目前已有針對標準光源D50對於大豆油墨所訂定的評估規範，然而卻未有針對其他標準光源的評估標準，透過本研究中的實驗法，針對四種最常見的標準光源D50，D55，D65，D75，並使用印刷油墨中的印刷四色C，M，Y，K進行實驗，透過研究者的視覺評估與色彩分析儀數據量測的方式，以標準光源D50為標準，判斷其CMYK在不同標準光源下油墨的色彩表現，並透過改變觀測環境，模擬出不同標準光源的油墨色彩，並結合色彩理論以及印刷品質評估進行分析，比較打樣與印刷品間，以及相同油墨在不同標準光源下的色彩表現。實驗結果發現，Cyan具有較嚴重的色差現象，而Magenta與Black則不顯著，而在D50光源下，四色滿版的色差值皆為相同，其他三種標準光源則對單一顏色具有影響，造成色差現象，可將其油墨與標準光源的變化，以及數位打樣與上機印刷品間的關係，給予廠商建議，作為檢測的依據，以及日後改善的機制。

關鍵字

同色異譜 ； 標準光源 ； 印刷品質檢測

並列摘要

Metamerism is one of the important factors determining the printing quality, mainly by the print material, the inks and the Artificial Daylight. Artificial Daylight use as a standard when against the visual assessment of the printing, determining the same printing achieve the best printing quality, or generate the color difference and colour shift, D50 is the standard and be using as the basis for the factory owner adjusting the inks with the Offset Press. There have the standard between the Soy ink and the D50, however, have never focus on the other Artificial Daylight, the research for the four most common Artificial Daylight D50, D55, D65, D75, and using the inks of C, M, Y, K with the experiment, through the visual assessment of the researcher and the measurement with the Spectrocolorimeter X-530, with the standard of the D50, against the color performance of the inks CMYK with different Artificial Daylight, and simulate the color by transforming the environment, also combine the color theory and print quality to analyze, compare the Direct Digital Color Proofing and Printing, and the color performance of the same inks under the different Artificial Daylight. With the result, the color difference is most notable on the Cyan ,and Magenta and Black have little significant effect, the value of color difference with four color are same under the D50, and the other three Artificial Daylight have effect on single color, generating the color difference or colour shift, can be the change with the inks and Artificial Daylight, and the relationship between Direct Digital Color Proofing and Printing, with the suggestion to the company, as the test basis, and the mechanism of improvement in the future.

並列關鍵字

Metamerism ； Artificial Daylight ； Quality Control

參考文獻

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