In the actual printing process of Jinan printing factory, there are many solutions to the problem of white edge or lace caused by inaccurate overprinting. Color matching, also known as color matching, is to solve the problem of printing alignment between different colors which is not easy to realize in the actual printing production process by using computer software. In the process of printing, there are many kinds of overlapping objects such as text, graphics and images, and there are many processing methods for overprinting.
If there are three or more spot colors that overlap each other, the apogee trapping area can be processed in two ways: overlapping and segmentation. When overlapped, the notch of the image overlaps with each other to form a black spot, which is mainly used for packaging printing in Jinan printing factory. During segmentation, the notch part is separated, which is mainly used for commercial printing.
Black is the most eye-catching color, so black or dark overprint is much more obvious than other light colors. In apogee, black is taken out separately to capture, which is no longer a pure black, but a redefined black, including black and other dark colors.
When is the color considered black? Apogee specifies that when the light value of the dark color in the software is greater than or equal to the specified black light value and the density is greater than or equal to the specified black light density value, the color is defined as black. By default, only colors with a fade value of 100% and a density greater than 1.6 are considered black. In the process of catching black, the soft big catch value must be used. If the black or dark color is formed by multiple overprinting, there is no need to overprint.
Jinan printing company will not notch the image by default, but if the image overlaps with the background color, the image will be hollowed out at the corresponding position of the background color, and the size of the image is the same as the hollowed out size, so it is necessary to notch the image at this time. Image capture can be divided into four situations: Center, normal, diffusion and blocking. When it is set to normal, the image edge has many sawtooth; when it is set to center, the image and foreground color expand mutually; when it is set to expand, the image expands to the background color; when it is set to shrink, the background color expands to the image.
In overlapping objects, if the preceding object is a glowing word or gradient bar, and its capture processing simply follows the principle of light color extending to dark color, the situation as shown in the figure will appear. It can be seen that since the neutral gray density of yellow is brighter than that of cyan, the yellow printing factory in front of the gradient bar will expand to cyan. The neutral gray density of magenta is darker than that of cyan, so the cyan at the back of the gradient bar will expand to magenta.
Digital mosaic is a comprehensive technology, which is not only affected by a series of technical parameters before, after and after printing, but also closely related to the specific production situation of the printing factory. Digital collage is an important process in the printing process. It is based on the requirements of printing and post printing process, reasonable arrangement of paper, in order to achieve the most effective use of paper. Let's learn more about how digital mosaic technology can effectively use paper to avoid unnecessary waste.
Because there are some differences between commercial rotary printing and sheet printing in structure, printing mode and folding mode, the layout of each page element on the large board is also very different from that of sheet printing.
Because of the limitation of roller circumference and door width, the opening size of roller has certain limitation to printing company. At present, the commonly used web width of commercial wheels is 546mm, 578mm, 610mm, etc. the web width used is less than or equal to the door width. The opening of the sheet press is much more flexible. It can not only choose to split paper, four open paper, eight open paper, etc., but also in special circumstances (that is, full open paper can be divided into two specifications, one large and one small). In addition, when different products use the same paper, as long as a printing plate is set up between the maximum paper feed and the minimum paper feed, the printing plate can also be selected flexibly.
The automatic alignment method of transfer press is to scan the alignment mark on the printing sheet through the positioning detection system, obtain the measurement data, compare the measurement data with the data of the standard sample sheet, and adjust the axial and circumferential direction of the corresponding drum by using the difference value; while the single plate press completes the paper positioning by front and side gauges, then extracts the template, and then observe the alignment mark and hand in the magnifying glass Under the dynamic adjustment of the roller's axis and circumference, to ensure the accuracy of overprinter.
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