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印刷色彩失真的原因有哪些?

  1. 颜色还原导致颜色失真

  1. Color reduction leads to color distortion

  现代印刷通常采用C、M、Y、K四色油墨复制,由于油墨本身的纯度,所以印刷套印也会产生色彩失真。

  Modern printing usually uses C, M, Y, K four-color ink reproduction, because of the purity of the ink itself, printing overprint will also produce color distortion.

  2. 分色引起的颜色失真

  2. Color distortion caused by color separation

  印刷通常使用C、M、Y和K四色油墨来复制的颜色,而图像信息收集的数字采集设备通常是R, G, B的信息,所以在印刷和制版之前,需要将图像信息转换成C、M、Y和K模式,即分色处理。

  Printing usually uses C, M, Y and K four-color ink to copy the color, and image information collection equipment is usually R, G, B information, so before printing and plate making, image information needs to be converted into C, M, Y and K modes, that is, color separation processing.

  所谓“分色”就是将图像中每个像素的颜色信息(一般为R、G、B颜色信息)分解成适合于打印C、M、Y、K模式的颜色信息。在分色过程中会引起色彩信息的丢失。

  The so-called "color separation" is to decompose the color information of each pixel in the image (generally R, G, B color information) into color information suitable for printing C, M, Y, K modes. In the process of color separation, it will cause the loss of color information.

  在分色,只有根据油墨、纸张和其他印刷适应性,分色参数的正确设置(如设置点扩张值、灰平衡参数,黑色板一步调整,等等),可以输出高质量的分色,尽可能减少颜色信息的损失。

  In color separation, only according to the adaptability of ink, paper and other printing, the correct setting of color separation parameters (such as setting point expansion value, grey balance parameters, one-step adjustment of black board, etc.) can output high quality color separation and minimize the loss of color information.

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  3.原稿有颜色失真

  3. The original has color distortion

  印刷的图像手稿大多是通过摄影获得的。除了在拍摄过程中操作不当造成的色彩失真外,色彩还会通过色彩材料等色彩材料进行再现,这些色彩材料容易褪色,也可能导致照片中的色彩失真。

  Printed image manuscripts are mostly obtained by photography. In addition to the color distortion caused by improper operation in the shooting process, the color will be reproduced through color materials such as color materials, which are easy to fade, and may also lead to color distortion in the photos.

  另外,随着数码相机的不断普及,越来越多的数字图像的手稿,和数码相机给操作员的技术要求大大提高,由于运营商的技术层面上,图像容易出现昏暗的画面,图像模糊和其他问题,导致原来的颜色失真。

  In addition, with the continuous popularity of digital cameras, more and more manuscripts of digital images and the technical requirements of digital cameras to operators have been greatly improved. As the operator's technical level, the images are prone to dark pictures, blurred images and other problems, resulting in the original color distortion.

  4. 扫描处理引起的颜色失真

  4. Color Distortion Caused by Scanning Processing

  照片原稿的图像密度是连续的,需要将图像信息收集到计算机中。使用扫描设备扫描图像时,需要将图像分割成离散的像素点,逐点逐行收集原稿上每个像素点的R、G、B信息。

  The image density of the photo manuscript is continuous, so it is necessary to collect the image information into the computer. When scanning an image with a scanner, it is necessary to divide the image into discrete pixels and collect R, G and B information of each pixel on the original point by point.

  在扫描过程中,像素的颜色信息会丢失,图像处理是基于收集到的图像信息,在此基础上进行所有的颜色操作,不增加图像的颜色信息。

  In the process of scanning, the color information of the pixels will be lost. Image processing is based on the collected image information. On this basis, all color operations are carried out without adding the color information of the image.

  因此,对于照片原稿来说,扫描是图像处理中的一个非常关键的环节,操作不当会造成图像色彩失真。

  Therefore, for photo manuscripts, scanning is a very critical link in image processing, and improper operation will cause image color distortion.


 
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