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BuKe factory >> Design >> 如何彩色圖片進行掃描

如何彩色圖片進行掃描

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2020-10-12 | 490 Views | 🔊 Click to read aloud ❚❚ ▶ | Share:
如何彩色圖片進行掃描

如何彩色圖片進行掃描

由於彩報用的是新聞紙,白度一般不夠,它的空白處密度值大約為0.15~0.2,這相當於銅版紙上C:3%,M:4%,Y:10%左右網點的總和。由於新聞紙帶有灰度且紙質松軟,油墨擴散大,吸墨性強,墨層的反射率低,所以在最深處即使給100%的K,仍然覺得不夠黑(密度不夠)。總之,新聞紙的反差小,只有1.2左右,這就決定了圖像的高光處C、M、Y、K四色都小面積絕網,在暗調處四色應該通過疊印油墨來加大反差(疊印總量不低於250),彩報不應將層次再現作為重點,應多用原色和間色,重用基本色而少用相反色或補色,使色彩鮮艷明快。對於膚色部分,應少用青版,以免發灰發暗,C、M、Y三色油墨疊印總量也應有意識地相對降低。

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如何彩色圖片進行掃描
如何彩色圖片進行掃描

 

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