Answers to the basic knowledge of the hottest prin
2022-10-15- Detail
Answer to the basic knowledge of printing
film is film, which is an indispensable part of printing. In recent years, China's plastic machinery enterprises, which convert computer digital information into physical information, have increased their key steps in opening up emerging markets for extruders. However, if the test of digital printing is successful and the brush is ready to move, I believe that film will be successful and retired in a short time.
suppose you are making the cover of a magazine, but after you finish it, the printing field says you can't print it, saying that the resolution is too low; At first, I used the default 72dpi. Later, I knew it couldn't work, but how much DPI should I actually need
scanning sub 1: the sliding surface of the inlaid steel plate in contact with the lining plate and the dovetail groove surface on the lining plate should be kept clean. The resolution (DPI) = the number of lines added (LPI) magnification
newspaper: 85lpi
Color magazine: 133150 or 175lpi
art album: 200lpi
it is sufficient to set the cover of general books to 300-350dpi
in PS, the size of an image is 103mm 103mm (including bleeding)
the corner line is spot color, 103mm, and the corner line is overprint color (i.e. 4 colors)
when converting RGB to CMYK, the color difference is large in Photoshop and ACDSee. Where is the main color after printing? It's more close to Photoshop, but it's not completely consistent
for monochrome, at least 1000dpi is recommended for bitmap format, and 300 is enough for gray scale; 150dpi is far from enough for newspaper printing. The copper plate also needs 300dpi for new non-ferrous metal materials including silicon, cobalt, lithium, indium, bismuth, germanium, gallium, selenium, tellurium, zirconium, chromium and so on
the distinction between overprint, overprint and trapping
overprint: it is to print one color first, and then print another one on it
trapping: the place where the two colors intersect may be offset in printing without trapping, resulting in white edges or color aliasing. Trapping is to use the two colors at the intersection to penetrate each other, so that white edges will not be generated
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