1 Purpose and significance of document preflighting
Since the printing house or the output center receives a large amount of foreign documents every day, in general, the customer's original documents are relatively focused on design and visual effects, and generally do not consider the output factor too much, so it is necessary to set up a document in advance in the prepress output process. The quality control of the inspection will cause the problem of output errors to be mined and corrected as far as possible in the front end. This will provide a standard electronic file for the next step, for RIP, digital proofing, CTF production or CTP plate making. Worry-free output provides protection; at the same time, due to the combination of design, output and printing, it helps to achieve the consistent performance of the document and the final printing effect.
This article will introduce the method and main content of document pre-inspection, and explain the specific software used in printing such as PhotoShop, Illustrator, CorelDraw, FreeHand and PageMaker.
2 File preflight method
1) Conventional method First of all, it seems that the software used in the manuscript is suitable for printing and publishing, and then the file is opened by the original software, and the function is checked by the function of the software itself, and if there is an error in the above content, the correction is performed.
2) Special methods can be assisted by other professional pre-test software, such as FlightCheck.
3 main content of document preflight
The main items of file pre-examination are the page size, bleed, text content, image format, image link, color mode, font, special effects, and overprinting, trapping, etc. Can be roughly classified as follows:
1) Whether the image class 1 is obscured, cut, invisible or abnormally displayed;
2 The format of the embedded graph is correct and compressed.
3 Is there an image in RGB format;
4 Is there a link to the original image, and the link is correct;
5EPS, TIFF map size is normal;
Whether the 6 embedded graphs have been rotated, scaled, cropped, or complicated later.
2) Whether the font class 1 is converted to Out line, whether the font is missing;
2 Whether there is garbled text exists;
Whether the 3PostScript fonts are provided with a Screen Font and a Printer Font;
4 Whether the text arrangement is consistent with the design;
5 Whether the text has a shift.
3) Whether the color of the color class 1 is filled with RGB color;
2 Whether there is a spot color;
3 Whether the spot color should be converted into a process color;
4 Is there a color that is not needed but is defined;
5 Gradient processing can meet the requirements.
4) Whether the positive dimension of other Class 1 finished products is consistent with the indicated size on the engineering order;
2 Whether the bleeding position can meet the requirements;
3 Whether the line thickness meets the publishing requirements;
4 Did you do an overprint? [next]
4 software "output trap"
1) PhotoShop
1 After editing the picture, you do not need to modify it, you must remove the unused channel;
2 If there are multiple Layers, all useful Layers must be merged and the unused Layers removed.
2) Illustrator
1 For the EPS image generated by Illustrator, check if the text is black or not. The Illustrator's 100% black is not automatic overprinting, but is hollowed out. You need to select the edge or fill 100 in the filter/color/black overprint function. % black overprint;
In 2Illustrator, the property of the vector graphics should be set to 800~2540dpi. If it is lower than this value, the edge of the vector graphics will be deformed.
In 3Illustrator, the white (white) fill and lines, you need to check the Overprint option in the property, if selected, the image elements will be lost at the output;
4 In the IIIustrator file, it is necessary to find out whether it is according to the layout of the heart or the physical distribution: Since Illustrator 8.0 only prints the range of valid images in the page, it does not print for blank spaces. If not set, the file size printed by the software will differ from the client-defined page size. For example, an A4 size page has only one image of 100 mm×100 mm, and the finished document is only 100 mm×100 mm. There are two ways to solve this problem:
a) Add a border to the page with the same size as the page. The color is set to colorless. If the software considers the colorless border to be valid, it will print the file at the normal size, and the border will be colorless. Normal image content.
b) Make adjustments when printing PS files. In the “Separation Settingsâ€, the “Boundary†settings, including left, right, top, bottom, ensure “right to left=file width, top to bottom=file height†"Special Note: If the file is not bleeding, the bleeding in the "Separation Settings" must be set to 0 mm when printing the PS file. [next]
3) CorelDraw
1 Paragraph text containing special characters in Chinese and English is prone to problems, such as "■, @, ★, ○";
2 use the new standard GBK font to solve the problem of lost words;
3 too small fonts, it is best not to use more than two colors to overprint, such as (C10 M30 Y80), etc., the same reason, does not apply to dark bottom anti-white characters. If you can't avoid it, you need to give the reverse white character, apply the background color or a certain printing monochrome (usually black);
4 Artwork text can be directly converted to curve and converted to a curve, the number of nodes of the text is controlled within 1500 points; the paragraph text should be exported as a curve using wmf format, then imported, and the color is set to be consistent with the original.
5 Some fonts turn into a curve and become a "hollow word", such as the body GB2312, imitation Song GB2312, Han Dingte black Jane, Han Dingmei black Jane, etc., please use with caution. In addition, some places where the English word turns after the curve will be hollowed out, so be careful;
6CorelDraw text layout, if the text is copied from WORD or Notepad, you need to remove double-byte spaces (using WORD to find/replace), otherwise it is easy to run;
7CorelDraw uses PSD to pass through the base map, which is easy to produce white lines, and can be converted into bitmaps first;
Do not do any "operations" after importing PSD files in 8CorelDraw, such as: rotation, mirroring, tilting, etc. Due to its transparent mask, the image will be broken after output; the image should be re-transferred in CorelDraw. ;
9CorelDraw can use the shading and pattern attached to the software to fill the graph or as a base map; use the appropriate precision, usually 1.5 to 2.0 times the number of output lines. If the accuracy is too low, the accuracy of the graph will be too high. Affect the output speed. The selected base map should pay attention to whether its attribute is CMYK mode. The underfill background of the general fill is RGB mode, which should be converted to four-color mode;
When the 10CorelDraw file has overprinting, the generated PS does not keep the file overprinting and cannot completely remove the overprint. It needs to be manually removed.
(11) Pay attention to the gradient fill of red → black when filling. After the error is set to (M100 → K100), the middle will be difficult to see. The correct setting should be like this: (M100→M100 K100), other cases analogy;
(12) Do not use RGB colors to fill color patches or lines;
(13) The gradient filling of the black part should not be too low-order, such as 5% black. Because there is a black overprint option when outputting, less than 10% of black usually uses substitution instead of overprinting, which causes problems. Similarly, use pure light black. Be careful;
(14) Single black î—¤ k100) Shadow please turn to four colors î—¤ C100M100Y100K100, otherwise the single black shadow will hollow out other color plates, it will be difficult to read when printed;
(15) CorelDraw uses “pattern fillâ€, CorelDraw10/11/12 is called “pattern fillâ€. After rotation or deformation, the pattern cut position will change. Please pay attention when copying (the solution is to turn the map);
(16) Spot colors cannot be pantone process color systemR and pantone hexchromeR coated, as these two spot color definitions will also be converted to four colors. Spot colors can't be edited for transparency and shadows, otherwise they will be converted to four colors. [next]
4) FreeHand
Do not put a grayscale image in 1FreeHand, otherwise all versions will have a mesh or overprinted three colors;
2FreeHand text also needs to turn the curve. When the Chinese and English are mixed, the paragraph text may be out of order.
If the 3FreeHand Chinese characters or lines are overprinted, they must be defined before placing other software, otherwise they cannot be overprinted
4FreeHand Chinese text after the path to set the fill or edge overprint, and then make other text path, FreeHand will automatically set its fill or border overprint 
In the same block of 5FreeHand, the two-color word is easy to run.
In the 6FreeHand, the right side of the cut chart will be sent out on the right side of the path.
7FreeHand fonts can not use the Heavy option, easy to paste 
In the old version of FreeHand, white fills and lines need to check the Overprint option in the property to avoid loss.
5) PageMaker
1 can not shrink the large picture into a small picture, the scaling picture in the layout software is very convenient, but the cost is multiplied or several times the output time, so be sure to set the size and resolution in the image processing software (such as Photoshop), Then put in the typesetting software
2PageMaker will only send half of the slender Tiff map, try to use DCS to save the map;
The EPS image in 3PageMaker cannot be colored, otherwise the screen will not be visible and the film may change color;
4PC machine input text placed in PageMaker should delete the space, otherwise it is prone to garbled 
5 Chinese font download using bitmap download, easy to lose words or make text symbols move, or make more than 30 pounds of large characters side jagged 
6 unaligned page, page top right, bottom right, etc. 
7 reference lines cannot be manually given coordinate parameters
8 can't scale or enlarge the finished page content.
The first paragraph of the 9-segment can not be achieved by playing four spaces. Otherwise, the position of the film in some places is not correct, or it is empty or empty.
10PageMaker's own glyph effect (bold, double shadow, underline, etc.), there will be ghosting or invalidation when outputting, these effects are best done in other software
(11) In pageMaker, when setting colors, you must name the colors. However, if the object imported or copied into the pageMaker file contains a color with the same name in the file, these colors will be replaced by the original color in the file.
(12) PageMaker file link diagram If there is RGB mode and EPS file with JPEG compression, both will be black and white. The solution is to convert the RGB mode to CMYK in Photoshop and convert the JPEG-compressed EPS file to normal ASCII or binary EPS.
(13) Forms made with Adobe Table software are difficult to place on pageMaker pages and need to be converted to EPS first. It should be noted that if the EPS file is placed directly into pageMaker, the font cannot be downloaded and the black is not overprinted. The solution is to open the EPS file using Adobe Illustrator, convert the text into a curve, and overprint the black filled object and line, re-storage and place it into the pagemaker.
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