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你知道印前图像为什么要加网吗?
作者:admin 来源:http://www.sdhzyw.com 发布时间:2018-9-21 15:02:56 浏览次数:526
你知道印前图像为什么要加网吗?想要了解就跟我们一起来看一下吧!!
Do you know why pre print images need to be netting? If you want to know, please come and have a look with us!
因为印刷工艺决定了印刷只能采用网点再现原稿的连续调层次,图若放大看,就会发现是由无数个大小不等的网点组成的。我们看到网点大小虽然不同,但都占据同等大小的空间位置,这是因为原稿图像一经加网以后,就把图像分割成无数个规则排列的网点,即把连续调图像信息变成离散的网点图像信息。

Because the printing process determines that only dots can be used to reproduce the continuous tone level of the original, if you zoom in, you will find that is composed of numerous dots of different sizes. We can see that although the size of the dots is different, they all occupy the same size of the spatial position, because the original image after screening, the image is divided into numerous regular arrangement of the dots, that is, the tone image information into discrete dot image information.

济南宣传页印刷

网点越大,表现的颜色越深,层次越暗;网点越小,表现的颜色越浅,表示的层次越亮。每个网点占有的固定空间位置大小是由加网线数决定的,例如,加网点目数为150lpi,则在一英寸的长度或宽度上有150个网点。网点空间的位置和网点大小是两个不同的概念,例如C50%代表的含义是网点大小占网点空间位置的50%,100%是指网点大小全部覆盖网点空间位置,即印刷中所称的"实地",0%由于没有网点,只有网点空间位置,所以这块地方就没有油墨被印上。
The larger the dot, the darker the color, the darker the layer; the smaller the dot, the lighter the color, the brighter the layer. The size of the fixed space occupied by each dot is determined by the number of screening lines. For example, if the number of screening dots is 150 lpi, there are 150 dots per inch in length or width. The location of dot space and the size of dot are two different concepts. For example, C50% means that dot size accounts for 50% of the space of dot. 100% means that dot size covers all the space of dot, i.e. the "field" in printing. 0% means that there is no dot and only the space of dot, so this place does not exist. Ink is printed.
显然挂网目数越大,网点所占空间位置越小,能描述的层次就越多,越细腻。事实上,原稿的层次和色彩就是通过这种挂网的方法被再现出来的。
Obviously, the larger the number of hanging meshes, the smaller the space position of the dots, the more levels can be described, the more delicate. In fact, the hierarchy and color of the manuscript are reproduced through this way of hanging nets.