What are the reasons for printing color distortion?
Many sets of color management systems have appeared in the printing industry, which provide book printing companies with great convenience in printing color control. However, the phenomenon of color distortion cannot be avoided during the color printing process. Then in the color printing, if the Chinese printers are able to master the main factors of distortion, then the color of book printing can be well grasped, and the complete effect in the mind of the customer can be achieved smoothly.
1. Scanning processing causes color distortion
The image density of the photo manuscript is continuous, and the 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 discrete pixels, and collect the R, G, and B information of each pixel on the original document line by point. In the scanning process, the color information of the pixels will be lost, and the image processing is based on the collected image information, and 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 manuscripts, scanning is a very critical link in image processing, and improper operation will cause image color distortion.
2. Color restoration processing causes color distortion
Modern printing usually uses C, M, Y, and K four-color inks to reproduce colors. Due to the purity of the ink itself, color distortion will also occur during color box printing.
3. Color distortion caused by color separation
Printing usually uses C, M, Y, and K four-color inks to reproduce colors, and the image information collected by digital acquisition equipment to the computer is usually R, G, and B information. Therefore, the image information needs to be converted into C, M, and M before printing. Y, K mode, that is, color separation processing. The so-called "color separation" is to decompose and convert the color information of each pixel of the image (usually R, G, B color information) into color information suitable for printing C, M, Y, and K modes. In color separation, only by setting the color separation parameters correctly according to the printability of ink, paper, etc., can it be possible to output high-quality color separations and minimize the loss of color information.
Color is very important for color book printing, which directly affects the quality problem after printing, so the problem of printing color distortion must be paid attention to.