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印刷图片中的处理影响印刷效果
作者:admin 来源:本站 发布时间:2018-8-29 16:09:20 浏览次数:436
在印刷前图片的处理,直接影响到印刷后的效果。济南印刷厂通过多年的实践经验,今天和大家一起讨论一下图片的一些处理技巧和需要考虑的问题。
The processing of pictures before printing directly affects the effect after printing. Jinan Printing Factory through many years of practical experience, today and we discuss some of the picture processing techniques and problems to be considered.
在对图片进行扫描前,首先应该审图。对图片的质量,应该做到心中有数,即图片的曝光是否存在过度或不足,需不需要去网等,这样,在扫描过程中就可以对图片进行适当处理,因为在扫描过程中处理图片,层次的损失是最少的。
Before you scan the picture, you should first examine the picture. The quality of the picture should be kept in mind, that is, whether the exposure of the picture is excessive or insufficient, do not need to go to the net and so on, so that in the process of scanning the picture can be properly processed, because in the process of processing the picture, the loss of the level is the least.
图片都用彩色扫描。如果是灰度图,使用彩色扫描效果会更佳,用彩色转成的灰度图比直接扫的灰度图更有层次,尤其是饱和度在70%以上的颜色上。在汉化的lino color elite设定面板上有一个“划线”选项,如果是印刷品就需要在这里选择数值,印刷精度越高的图片选择的数字越大。另外“颜色校准”等6个选项可以选择缺省,可以根据自己的情况选择。“校准”里的“颜色助理”,是一个很好用的工具,针对图片选择不同的方式,或自由确定所选数值,在图片扫描过程中调整数据,会保留更多的层次和细节。

The pictures are scanned in color. If it is a grayscale image, the use of color scanning effect will be better, the grayscale image converted from color is more hierarchical than the direct scan grayscale image, especially in the saturation of more than 70% of the color. There is an "underline" option on the lino color elite settings panel in Chinese. If it is printed, you need to select the number here. The more accurate the image is, the larger the number is. In addition, "color calibration" and other 6 options can be chosen by default, and can be selected according to their own circumstances. The "color assistant" in "calibration" is a very useful tool for selecting different ways for images, or freely determining the selected values, adjusting the data during the image scanning process, will retain more layers and details.

济南彩色设计印刷

在实际操作中,灰度图的处理会相对简单一些。将彩色图像交换成灰度图像有两种方法:直接用“模式”功能进行转换;或是先将彩色图像转换成lab模式,再删除“a通道”和“b通道”,最后将图像转换成&“灰度”。在色度lab模式转换中,亮度l通道保留了较多的层次变化,因此效果会更好一点。灰度图片定好黑白场后,要注意图片的层次,中间色调一定要拉开,否则图片就会有雾蒙蒙的感觉,又脏又不清晰,把中间色调的对比度增大,就会明显改善这种状况。
In practice, the processing of grayscale will be relatively simple. There are two ways to exchange color images into gray images: directly using the "mode" function for conversion; or first converting color images into lab mode, then deleting "a channel" and "b channel", and finally converting the image into "gray". In the color lab mode conversion, the luminance L channel retains more hierarchical changes, so the effect will be better. After the gray level picture is set in black and white, we should pay attention to the level of the picture, the middle tone must be pulled apart, otherwise the picture will have a foggy feeling, dirty and unclear, the contrast of the middle tone will increase, it will obviously improve this situation.
在使用photoshop处理图片的过程中,不要让图片在两种模式上转来转去。因为,每进行一次转换,都将损失一部分原图片的细节信息。在将rgb模式图片转换成cmyk模式图片时,分色参数将对图片转换时的效果好坏起到决定性的作用。对分色参数的调整,将在很大程度上影响图片的转换。photoshop图片处理软件具备对分色参数的控制能力,也就是说,当需要将以rgb模式处理好的图片转化为cmyk模式进行输出时,在转换过程中通过分色参数的调整可以减轻在图片进行模式转换时的色彩丢失。
In the process of using Photoshop to process pictures, don't let the pictures turn around in two modes. Because each transformation will lose part of the details of the original picture. When the RGB mode picture is converted to CMYK mode picture, the color separation parameter will play a decisive role in the effect of image conversion. The adjustment of color separation parameters will affect the conversion of images to a large extent. Photoshop Image processing software has the ability to control the color parameters, that is, when the need to RGB mode processed pictures into CMYK mode for output, in the conversion process through color separation parameter adjustment can reduce the loss of color in the image mode conversion.
如果将rgb模式图片转换成cmyk模式时,在操作步骤上加上一个中间步骤,即先转换成lab模式。lab模式由三个通道组成,l通道表示亮度,它控制图片的亮度和对比度,a通道包括的颜色从深绿(低亮度值)到灰色(中亮度值)到亮粉红色(高亮度值),b通道包括的颜色从亮蓝色(低亮度值)到灰色到焦黄色(高亮度值)。
If the RGB mode picture is converted to CMYK mode, an intermediate step is added to the operation step, which is converted to lab mode first. The L A B mode consists of three channels. The L channel represents brightness. It controls the brightness and contrast of the picture. The a channel includes colors from dark green (low brightness) to gray (medium brightness) to bright pink (high brightness), and the B channel includes colors from bright blue (low brightness) to gray to focal yellow (high brightness).
不同的图片需要不同的处理方法,像国画之类的图片一定要忠实于原片,不能因为效果好看而改变它的颜色。漫画书法之类的图片在保证它的细节不被损失外,可以考虑用位图,这样既清晰且图片容量也小,会提高发排的速度。
Different pictures need different processing methods, such as traditional Chinese painting and other pictures must be faithful to the original film, not because the effect is good to change its color. Pictures such as comic books and calligraphy, in addition to ensuring that its details are not lost, can consider using bitmaps, so that both clear and small picture capacity, will improve the speed of the layout.
上文内容是由济南书刊杂志印刷厂家提供,想要了解更多的内容,可以关注我们的网站:http://www.sdhzyw.com,在网站中有更多精彩内容等着你,感谢你对我们公司的关注!
The above content is provided by Jinan Book and Magazine Printer. If you want to know more, you can pay attention to our website: http://www.sdhzyw.com. There are more wonderful content waiting for you in the website. Thank you for your attention to our company.