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深圳印刷廠-畫冊印刷-包裝盒定做-包裝廠家-深圳步殼印刷廠

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在包裝印刷廠如何選用網點

From:Buke printing factory of China深圳步殼印刷廠 | Author:China Bukeprinting factorybook0755 | Published time: 2020-07-14 | 491 Views | 🔊 Click to read aloud ❚❚ | Share:
在包裝印刷廠實際印刷生產中,絕大部分印刷品選用調幅網點加網復制,選定調幅加網時要註意以下幾項原則:
在包裝印刷廠如何選用網點

在包裝印刷廠實際印刷生產中,絕大部分印刷品選用調幅網點加網復制,選定調幅加網時要註意以下幾項原則:

(1)網角選用原則主色調:45°,黃色:90°或0°,其他兩色15或者75°,具體如下:
 
  ①以消色為主的網角選用。圖片以消色為主,彩色為輔的這類原稿加網復制時,

    ②以暖色調為主的網角選用,

    ③以冷色調為主的網角選用。

(2)加網線數的選用不同類印刷品選用加網線數

(3)網點形狀的選用。

三種常用網點形狀在印刷時,其網點擴大變形是不同的。方形網點在50%處網點變化呈跳躍狀,使中間調層次的過渡性差、階調再現不柔和,因此,方形網點不適合中間調層次豐富的原稿印刷。圓形網點印刷時在70%網點處出現較大跳躍,易使暗調層次並級、糊版。因此適合於以高、中調為主的原稿印刷復制。菱形網點印刷時網點在35%處與65%處才出現較小跳躍,避開了中間調網點較大的變化,減弱了密度躍升的程度,特別適合於以中間調為主的人物和風景圖片,是使用較為普遍的一種網點形狀。

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