Print Knowledge Summary 7B
What to do before output film?
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1, the file format
Most of the output centers use square psrpt dot color output systems, and there are also systems using Hari Kun or Israel's Saturn. But it has one thing that supports the postscrit printer description file. This is the file with the .ps extension. Currently more popular design software: PS, pagemaker, cd, illustrator, etc. all support PS printing. The s2, ps2, and ps files generated by some Founder software such as Founder, Verizon, and Feiteng can only be output using pspnt, and other output systems do not support it. There are other word processing softwares such as word, wps2000, etc. Theoretically, ps files can be generated in the same way, and the film can be output. However, in fact, the prepress output must be processed such as imposition, registration lines, and cutting lines. , And word, wps2000 and other software can be said to be powerless in this regard, especially the color draft, once it is done, go to the post-processing, will bring great difficulties to the prepress output workers. Therefore, try to use pagemaker and a series of professional design and layout software.
2, on the picture format, accuracy
Modern offset printing uses offset printing (four-color overprinting), which divides the image into four colors: blue (C), product (M), yellow (Y), black (four-color dot film, and then into the PS version. After the offset printing machine prints four times, it comes out as a color printed product, so the printing image is different from the usual computer display image, and the image must be converted to the CMYK mode, but not the RGB mode or other modes. When the picture is converted into dots, which is the precision: dpi, the printing image with a theoretical minimum precision to reach 300dpi / pixel / inch, so the picture you usually use can not be based on display, not because the picture through acdsee or other software Seeing it is very beautiful, after zooming in it is also very beautiful and thinks it can be used for printing, must be opened by ps, use the image size to confirm its true accuracy.For example: a picture resolution is 600*600dpi/pixel/inch, So, its current size can be magnified to more than double the use of no problem. If the resolution is 300 * 300dpi, then it can only be reduced or original, can not be enlarged. If the resolution is 72*72 dpi/pixel/inch, then it must be reduced in size (relatively higher in dpi accuracy) until the resolution becomes 300*300 dpi, and it can be used.(when using this function, ps will be The "Redefine pixel" item in the image size option is set to none.)
3, on the color of the picture
With regard to some technical terms such as overprinting, overprinting, hollowing out, and spot colors on printing, we can refer to some of the relevant printing basics, which I will not explain here one by one. Just say some common sense that must be noted. The first is the hollow problem. For example, if a blue line is pressed on a red bottom plate, then the blue word on the red plate of the film must be empty. On the contrary, the blue version is also the same. The second is the overprint problem. For example, if there is a line of black on a red board, the black text should not be hollowed out in the red version of the film. The second is the four-color word problem. This is a more common problem. Before outputting, the black letters in the publication document must be checked, especially the small words. It is not only on the blackboard, but it should not appear on other three-color editions. If this is the case, the quality of the printed product will be discounted. When the RGB graphics are converted to CMYK graphics, the black text will become 100% black. It must be processed before the film can be output.
4, on the output of the hanging network accuracy
Hanging net accuracy is generally referred to as hanging nets. The higher the precision of the netting, the finer the printed products, but it has a greater relationship with paper and ink. If you print a picture with a high mesh size on a general newsprint (newspaper), then the picture will not only become more exquisite, but will become a mess (miserable), so you must know about your print before exporting. What is the printing paper, and then determine the accuracy of the hanging net. General common paper and hanging mesh accuracy: imported coated paper or stickers, etc.: 175-200 lines imported offset paper, etc.: 150-175 lines of ordinary offset paper, etc.: 133-150 lines of newsprint: 100-120 lines to By analogy, the poorer the quality of the paper, the lower the hanging net, and vice versa. To sum up, before printing, it is necessary to pay attention to the following issues: First, the production of more commonly used design and production software, such as pagemaker, etc., like the word as much as possible. Second, the pattern of the picture in the text must be CMYK mode, with an accuracy of at least 300*300 dpi/pixel/inch. Third, check whether the text in the publication is a four-color word. If yes, change it to monochrome 100% black. Fourth, if using pagemaker, WISE, Founder Edition, Illustrator, must link its picture file and the original file to be copied. 5. The photoshop file is preferably a psd (unconsolidated layer) file for easy modification. Sixth, the font is best to use common fonts, such as Founder, Wending. Try not to use rare fonts. If used, coreldraw and Illustrator first convert the text to outline, which avoids the problem that the output center cannot output without such a font. If you have a make-up file, you must copy the make-up file. 7. Clearly report the finished product size, printing capacity, printing paper, etc. of the output center to facilitate the imposition and hanging nets. Eight, if two pages are the same, but the black text is different (often encountered), then only the first page of CMYK four colors, and the second page of the K color can be, so as not to waste, but also save money. If there are only two colors (such as red and black) and the printing requirement is not high, it is only necessary to output it in one color version at the same time, and it is not necessary to divide the output into two colors. Deal with the printing plate. It also saves money.