Most of the output centers now use the Foundry Grid (pspnt) dot-separation output system, and some systems use Harikun or Israel's Game Angel. But they all have one thing in common and support postscrit printer description files. That is, a file with a suffix of .ps.
Currently 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 Book Edition, Weisi, and Feiteng, can only be output using pspnt, and other output systems do not support it. There are some other word processing software such as word, wps2000, etc. In theory, ps files can also be generated, and film can be output, but in fact, pre-press output must be processed such as imposition, plus registration rules, cutting lines, etc. And software such as word and wps2000 can be said to be powerless in this respect, especially the color manuscript, once it is done, and then go to the post-processing, it will bring great difficulties to the pre-press output staff. Therefore, try to choose a series of professional design and layout software such as pagemaker.
1. About the format and accuracy of the picture
Modern offset printing uses offset printing (four-color overprint), that is, the picture is divided into four colors: cyan (C), product (M), yellow (Y), black (K) four-color dot film, and then dried into The PS version is printed four times through an offset press, and after it comes out, it is a colored printed product. Therefore, the pictures for printing are different from the pictures for ordinary computer display, and the pictures must be converted to CMYK mode, not RGB mode or other modes. Because the output is to convert the picture to a dot, which is the precision pi. The theoretical accuracy of the printing picture should be at least 300dpi / pixel / inch. Therefore, the picture you usually use cannot be based on the display. The software is very beautiful, and it is very beautiful after zooming in. It is considered to be used for printing. It must be opened by photoshop, and the image size is used to confirm its true accuracy. For example, if the resolution of a certain picture is 600 × 600dpi / pixel / inch, then its current size can be enlarged to more than double to use without any problem. If the resolution is 300 × 300dpi, then it can only be reduced or the original size can not be enlarged. If the resolution of the picture is 72 × 72dpi / pixel / inch, then it must be reduced in size (the dpi accuracy will be relatively large) until the resolution becomes 300 × 300dpi before it can be used. (When using this function, set the "Redefine Pixel" item in the image size option in Photoshop to None.)
Second, about the color of the picture
Regarding some professional terms such as overprinting, overprinting, hollowing out, and spot color on printing, you can consult some related printing basic knowledge, I will not explain them one by one here. Just say some common sense that must be paid attention to.
The first is the problem of hollowing out. For example, if there is a line of blue words pressed on a red bottom plate, then on the red version of the film, the position of the blue words must be empty. The same is true of the blue version.
The second is overprinting. For example, if a line of black characters is pressed on a red base plate, then on the red version of the film, the position of the black characters should not be hollowed out.
The third is the four-color character problem. This is also a relatively common problem. Before exporting, you must check whether the black characters in the publication file, especially the small characters, are only on the blackboard, and should not appear on other three-color versions. If this is the case, the quality of the finished product will be discounted. When RGB graphics are converted to CMYK graphics, 100% of the black text will become four-color black. It must be processed before exporting the film. 4. About the accuracy of the net when outputting. The accuracy of netting is generally called netting. The higher the accuracy of netting, the more exquisite the printed product, but it has a greater relationship with paper and ink.
If you print a picture with high mesh size on general newsprint, then the picture will not only become more exquisite, but will become a mess, so you must understand what the printing paper for your print is before output , And then determine the accuracy of the net. Commonly used paper and hanging mesh accuracy: imported coated paper or stickers, etc .: 175-200 lines, imported offset paper, etc .: 150-175 lines, ordinary offset paper, etc .: 133-150 lines, newsprint: 100-120 lines, to By analogy, the worse the quality of the paper, the lower the mesh size, and vice versa. To sum up, the issues that must be noted before outputting before printing are:
1. Use more commonly used design and production software, such as pagemaker, etc., and try not to use it like word.
2. The mode of the picture in the article must be CMYK mode, and the precision is at least 300 × 300dpi / pixel / inch.
3. Check if the text in the publication is a four-color character, and if it is, change it to monochrome 100% black.
4. If you use pagemaker, Weisi, Founder Book Edition, Illustrator, you must copy the linked image file and the original file together.
5. Photoshop files are preferably psd (unmerged layers) files for easy modification.
6. It is best to use commonly used fonts, such as Founder and Wending. Try not to use rare fonts. If used, coreldraw and Illustrator will first convert the text to the outline (outline) method, which can avoid the problem that the output center cannot output because there is no such font. If there is a supplementary word file, the supplementary word file must be copied together.
7. Definitely report the finished product size, printing volume, printing paper, etc. of the output center to facilitate imposition and net hanging.
8. If the content of the two pages is the same, but the black text is different (often encountered), then only the four colors of CMYK on the first page and the K colors of the second page can be output, 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, you only need to output them in one color version at the same time, and there is no need to divide them into two color outputs. Just do it when printing plate making. Also save money. [next]
Three, 12 output preparation points
1. Set up the file so that the page size of the typesetting file matches the page size of the printed product, and the application software automatically generates the correctly positioned cutting line. Use numbers-now every typesetting software provides two methods to determine the size and position of page elements. One method is the perceptual method of clicking and dragging the mouse, and the other is the objective method of entering numbers from various dialog boxes and control panels. To make sure that the width of a box is exactly one and a half inches, the only correct way is to enter 1.5 in the width field, rather than using your eyes or aligning the reference line and size.
2. Unless the font is very complicated or detailed, otherwise any text in the EPS file will be converted into a path before you enter the picture into the typesetting software. Use good fonts-many output centers do not want to see TrueType characters, PostSript has become a standard.
TrueType usually has the same word name as the corresponding PostSript word, which can cause conflicts. TrueType must be manually downloaded into the RIP of the imagesetter, which is very time-consuming, please contact the output center in advance. Do not use font commands to produce bold or italic effects. It is best to select the desired font effect directly from the application software font menu. If the font does not have the desired bold or italic effect, and the font command is used, MAC will forge a bold or italic effect for each word, but this is only on the screen.
If it is output on the printer, the final printing effect looks as if it has not been used at all. So, what is the effect of using the bottom line? Don't use those fonts that have no effect, but use font commands. If you use fonts with beautiful serifs or fine strokes (Bodoni is a good example), and the size of the characters is set to be very small, do not separate the characters. Otherwise, even a slight misalignment on the printing plate will cause overprinting of the most sensitive parts.
3. Scan or obtain images at the final output size and appropriate resolution as much as possible (larger is not necessarily good).
4. Rotate, mirror or invert the image in the software that created the image, not in the typesetting software.
5. Remove extra paths and channels before storing the last picture to simplify the file.
6. If the image is to be separated, use the CMYK mode to define the color. If it is not output in this way, it is defined as the spot color.
7. Store pictures in uncompressed TIFF or EPS format.
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