Summary of several error-prone points in printing design
1. The graphic color mode must be CMYK or grayscale.
2. If you need a large area of ​​pure black background in the color picture, it is recommended to use K: 100, C: 30, such black printing is brighter than the one-color black, and because of the existence of the blue version, it can make up for the flaws of black printing. . Of course, this value is not fixed. I once made a folio poster, using K: 100, C: 80. This is because the area is too large, the printing machine is fast, and it is difficult to make the color. So the value increases accordingly. In addition, if there is a warm color pattern on the entire picture and the edges are feathered, or there are warm colors and transparent, etc., the value at this time will be adjusted according to the actual main warm color, such as K: 100, M: 60, Y: 70, This pattern transition is very comfortable, not as weird as K: 100. You can see this phenomenon by experimenting in PHOTOSHOP.
3. Anti-white characters or thin white lines on the motley pattern. When choosing fonts (or line pounds), be careful not to use too thin fonts like Song and thin circles, try to use fonts with obvious lines such as boldface, Lishu, etc., in case of inaccurate registration, the text or lines are not clear Case.
4. For things such as small hang tags that need to be rolled and punched, pay attention, and try not to design the outer border. Because if there is a slight deviation in the plate position during box rolling, there will be a situation where one side is large and the other side is small.
5. Pay attention to the design of newspaper manuscripts and offset paper. Newsprint and offset paper are relatively ink-intensive. Therefore, in addition to paying attention to the number of meshes when film is produced, it is also necessary to reduce the chroma when making, such as making newspapers For the manuscript, you need to see a gray scale of 30, so the gray scale is set to about 24 when it is produced, so that it is printed on some gray newsprint, and the actual effect is equivalent to 30 gray scale. (Double) The offset paper is whiter than newsprint, and the adjusted chroma can be lower than normal copperplate printing and higher than newspaper manuscripts, depending on experience and feeling.
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