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BuKePrinting >> knowledge >> 印刷的同色異譜是什麽

印刷的同色異譜是什麽

From:Buke printing factory of China深圳步殼印刷廠 | Author:China Bukeprinting factorybook0755 | Published time: 2020-07-25 | 484 Views | Share:
同色異譜就是顏色的外貌相同,但光譜組成不同的顏色。利用顏色混合的方式來產生或者替代所需要的顏色,這種現象廣泛存在於彩色印刷、攝影、繪畫、印染等用色領域在實際生產中,常常遇到的配色問題,即要求配出與樣品相同的顏色,但復製品所用的色料不可能與樣品的色料完全相同,用不同的色料與配方復制同樣的顏色,其光譜反射或透射率曲線就不可能相同。
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印刷的同色異譜是什麽

同色異譜就是顏色的外貌相同,但光譜組成不同的顏色。利用顏色混合的方式來產生或者替代所需要的顏色,這種現象廣泛存在於彩色印刷、攝影、繪畫、印染等用色領域在實際生產中,常常遇到的配色問題,即要求配出與樣品相同的顏色,但復製品所用的色料不可能與樣品的色料完全相同,用不同的色料與配方復制同樣的顏色,其光譜反射或透射率曲線就不可能相同。

例如,彩色印刷原稿種類多種多樣,有彩色反轉片、彩色照片、國畫、油畫、水彩畫等,各種原稿色料不同,而印刷復制所用的色料只有黃、品、青、黑4種墨及紙張的白色,所以說彩色印刷完全是利用同色異譜色對原稿的豐富色彩進行復制。在印刷中用黑墨替代三原色彩墨疊印產生的非彩色可以節省油墨,提高印刷的質量和印刷速度,正是利用了同色異譜的結果。


需要註意的是,同色異譜是有條件的,只有在特定的照明條件下和特定的標準色度觀察者光譜三刺激值時,它們才有相同的三刺激值。當改變視場或照明條件時,重新計算出的兩個顏色樣品的刺激值就會不相等,兩個顏色不再是同色了。

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