1, color reproduction processing causes color distortion

Modern printing usually uses C, M, Y, and K four-color inks to reproduce colors. Because of the purity problems of the ink itself, color distortion occurs when printing overprints.

2, color separation processing causes color distortion

Catalogue printing usually uses C, M, Y, K four-color ink to copy colors, and the image information collected by the digital acquisition device to the computer is usually R, G, B information, so the image information needs to be converted into C, M, before printing and plate making. Y, K mode, that is, color separation processing. The so-called “separation” is to decompose the color information (generally R, G, B color information) of each pixel of the image into color information suitable for printing C, M, Y, K modes. Color information is lost during the color separation process. In the color separation, only according to the catalogue printing suitability of ink, paper, etc., correctly set the color separation parameters (such as setting the dot gain value, gray balance parameter, black tone, etc.), it is possible to output high quality color separation chips. May reduce the loss of color information.

3, the original has color distortion

Catalogue printing image manuscripts are mostly obtained by means of photography. For photo originals, in addition to color distortion caused by improper operation during shooting, since the color is reproduced by a coloring material such as a color material, the coloring material is liable to cause color attenuation, and thus may cause distortion of the color of the photo. In addition, with the continuous popularization of digital cameras, digital image manuscripts are more and more, and the technical requirements of digital cameras for operators are greatly improved. Due to the poor technical level of operators, the images taken are likely to appear dim, blurred images, etc. The problem is that the original is distorted in color.

4, scanning processing causes color distortion

The image density of the photo original is continuous, and image information needs to be collected into the computer. When scanning an image with a scanning device, it is necessary to divide the image into discontinuous pixels, and collect R, G, and B information of each pixel on the original line by line. During the scanning process, the color information of the pixel is lost, and the image processing is based on the acquired image information. All the operations on the color are also performed on this basis, and the color information of the image cannot be increased. Therefore, for photo originals, scanning is a very important part of image processing, and improper operation will cause image color distortion.