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BuKePrinting >> Bookprinting >> 關於色差【步殼印刷​】

關於色差【步殼印刷​】

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2022-07-13 | 12 Views | Share:
關於色差【步殼印刷​】

關於色差【步殼印刷】


在彩色印刷復制工作中,出版社或客戶驗收印刷品時,如何才能說明印刷品是不是符合要求,一個主要的指標就是印刷品的顏色與簽樣樣張的顏色的符合程度。這兩個顏色之間的差異情況,是以色差來表示的。色差的單位是NBS,這個單位是美國國家標準局的縮寫。目前世界各國通用的顏色丈量標準是CE1976ab均勻顏色空間,是於1975年第十八屆CIE大會上由加拿大人威澤斯基提出來的。其中L表示心理明度,a、b則表示心理色度,其色差則用△E表示,當a為正值時,表示偏紅,為負值時表示偏綠;當b為正值時,表示偏黃,為負值時表示偏藍;L為正值時表示顏色偏淺,反之則偏深。色差值△E在小於3的時候,色差給人的感覺不是很大,但也受深、淺色及承印材料的影響。出版社或客戶對印刷品的驗收標準是由雙方協議的,可以規定△E在某個範圍內應作為正品。

 

關於色差【步殼印刷】

關於色差【步殼印刷】

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