What should I do before outputting the film?
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1, the format of the file
Most of the current output centers use the square-scale grid (pspnt) dot-segment color separation output system, and some systems using Harry Kun or Israel's game angels. But they all have one thing in common, supporting the postscrit printer description file. This is the file with the suffix .ps. Currently more popular design software: photoshop, pagemaker, coreldraw, illustrator, etc. all support PS printing. The s2, ps2, and ps files generated by some Founder software such as Founder, Weiss, and Feiteng can only be output with pspnt, and other output systems do not. Others have some word processing software like word, wps2000, etc. In theory, ps files can also be generated, and the film can be output, but in fact, the prepress output must be processed such as imposition, add-on alignment lines, and cutting lines. And word, wps2000 and other software can be said to be powerless in this respect, especially the color draft, once done, and then go to post-processing, will bring great difficulties to the pre-press output staff. Therefore, try to use a series of professional design and layout software such as pagemaker.
2, about the format and accuracy of the picture.
Modern offset printing uses offset printing (four-color overprinting), which is to divide the picture into four colors: blue (C), product (M), yellow (Y), black (B) four-color dot film, and then sun-dried The PS version, after four printings by the offset press, is a color printed product. Therefore, the picture for printing is different from the picture for normal computer display, and the picture must be converted to CMYK mode, and RGB mode or other modes cannot be used. Because the output is to convert the picture into dots, that is, the precision: dpi, the theoretical precision of the printing picture is 300dpi/pixel/inch. Therefore, the pictures used by ordinary people cannot be displayed. Do not pass the picture through acdsee or Other software sees it very beautiful. It is also very beautiful after zooming in and it can be used as printing. It must be opened by photoshop, and the image size is used to confirm its true precision. For example, if a picture resolution is 600*600dpi/pixel/inch, then its current size can be magnified by more than doubled. If the resolution is 300*300dpi, then it can only be reduced or enlarged, and can no longer be enlarged. If the image resolution is 72*72dpi/pixel/inch, then the inch must be reduced (the dpi accuracy will be relatively large) until the resolution becomes 300*300dpi. (Use this function to set the "Redefine Pixels" item in the Photoshop Image Size option to None.)
3, about the color of the picture
For some technical terms such as overprinting, overprinting, hollowing out, and spot color on printing, you can check out some related printing basics. I will not explain them here. Just say some common sense that must be paid attention to. The first is the hollowing out problem. For example, if a red board is pressed with a blue line, then in the red version of the film, the position of the blue word must be empty. The same is true for the blue version. The second is the overprint problem. For example, if a red board is pressed with a black line, then the position of the black word should not be hollowed out on the red version of the film. The second is the problem of four-color words. This is also a more common problem. Before you go out, you must check the black characters in the publication documents, especially the small characters. Is it only available on the blackboard, but not on other tri-color plates? If it is, the quality of the printed product will be discounted. When the RGB graphics are converted to CMYK graphics, the black text will become four-color black. It must be processed before the film can be output.
4, about the accuracy of the hanging network when outputting.
The accuracy of hanging net is generally called hanging net. The higher the precision of hanging net, the more exquisite the printed product is, but it has a great relationship with paper and ink. If you print a picture with a high net on a general newsprint (newspaper), then the picture will not only become more beautiful, but will become a mess (not terrible), so you must know about your print before exporting. What is the printing paper, and then determine the accuracy of the hanging net. Common common paper and hanging mesh accuracy: imported coated paper or stickers, etc.: 175-200 line imported offset paper, etc.: 150-175 line ordinary offset paper, etc.: 133-150 line newsprint: 100-120 line, In this way, the worse the paper quality, the lower the hanging net and vice versa.
To sum up, the issues that must be noted before the prepress output are:
First, the production of more commonly used design and production software, such as pagemaker, etc., like Word, try not to use.
Second, the mode of the picture must be CMYK mode with a minimum precision of 300*300dpi/pixel/inch.
3. Check if the Chinese text in the publication is a four-color word. If it is, change it to monochrome 100% black.
Fourth, if you use pagemaker, Weiss, Founder Edition, Illustrator, you must copy the link image file and the original file.
Fifth, the photoshop file is preferably a psd (uncombined 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 an outline, which avoids the problem that the output center cannot be output without such a font. If there is a supplementary word file, the supplementary word file must be copied together.
7. Clearly report the finished product size, printing volume, printing paper, etc. of the printed output of the center to facilitate imposition and hanging
Eight, if the two pages are the same content, but the black text is different (often encountered), then you only need to output the CMYK four colors of the first page, and the K color of the second page, so as to avoid waste and save money. If there are only two colors (such as red and black) and the printing requirements are not high, just output them in one color version at the same time, and do not need to be divided into two.