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BuKePrinting >> Bookprinting >> 像素值宣傳手冊印刷​

像素值宣傳手冊印刷​

From:Buke printing factory of China | Author:China Bukeprinting factorybook0755 | Published time: 2020-09-02 | 355 Views | 🔊 Click to read aloud ❚❚ ▶ | Share:
​像素值的大小，控制著網點面積的大小，在調加同中，是以一些微粒點子作為獨立的像素單位。

   像素值宣傳手冊印刷

像素值的大小，控制著網點面積的大小，宣傳手冊印刷在調加同中，是以一些微粒點子作為獨立的像素單位。

它們隨機的分佈在個特定的單位區域，其面積根據計算方法的不同而有差別。調頻加網採用的“網點”是一個極小的單位。

它們具有固定的尺寸，相對獨立分佈在每個單位區域中，以不同數量點的微粒，以不規則的方式，表現原稿每種色彩的顏色值。

採用數字加網系統實現調幅加網時，宣傳手冊印刷將輸入圖像像素的灰度值與網點模型中的加網同相比較，宣傳手冊印刷如果大則激光束曝光，產生曝光點。

否則不曝光。加網閾值在單元網格內規則排列，宣傳手冊印刷自網格中心到網格邊緣，加網閾值由小到大逐漸增大，從而保證隨著像素灰度值的由小到大形成的網點由網格中心向四周擴張。

直到布滿整個網格。宣傳手冊印刷而調頻網點的關鍵是打破了網點模型存儲器中的調值分佈規律。

使由輸入圖像像素灰度值決定的若乾個著墨點在單位網格中隨機且均勻地散開，即建立在單位網格範圍內分配點元素的隨機數序列。

不過為了避免同一灰度值網點分佈狀況雷同，宣傳手冊印刷在調頻加網中一般不做成固定的網點模型存儲器，即使像素灰度值相同，點元素個數相同。

但分佈的順序可以不同，從而實現隨機加網。

像素值宣傳手冊印刷
像素值宣傳手冊印刷

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