Technical requirements for the original layout of the printing house “Vaite”
All original layouts provided for digital reproduction must meet the following technical parameters:
1. Electronic media
USB Flash, CD, DVD. It is possible to transfer materials through any available file sharing. (For example, FEX. NET (optimal for Ukraine), or dropmefiles.com).
Self-disclosing archive files are not allowed.
2. File formats
Adobe PDF standard x1a;
Adobe PhotoShop; Adobe Illustrator; Adobe InDesign; QuarkXpress; Corel – for raw materials.
3. Electronic Layout Requirements
The electronic layout of the printing house can be provided as a single file or as separate files for each column.
The orientation and size of the image in the multi-column single file must be identical for all pages, and their order must be followed. It is not allowed to use files prepared by spreads: only page files are accepted.
In exceptional cases, it is allowed to provide files with covers on the cover. “Face” and inversion must be provided either in reversals or page by page. It is not allowed to provide the “face” of the cover with a reversal, and the reverse page by page.
4. Technological parameters of the layout
The format of the future product must be agreed with the printing specialist, as the chosen format of the future edition may not meet the technological parameters of printing and post-printing equipment.
For all types of work should be prepared “departures” (allowances) of 2 mm on each side and 5 mm for work on the thread seamstress. The location of significant elements from the edging format should be at least 3 mm.
During the preparation of the PS-file, the paper format is assigned taking into account the size of the “departures” and technological shores. The image must be centered.
“TrimBox”, if there is information about yourself in the files, must correspond to the edging format and describe it.
5. Technological parameters of the printing process
It is not allowed to use lines with a stroke less than 0.5 pt thick and place text blocks using a font size less than 6 pt, if you print them upside down on a background that is a composite color, as well as in the case of assigning a shade consisting of two and more paints.
When using thin lines, it is necessary to take into account the minimum thickness that is reproduced during printing, depending on the density of the raster:
up to 24% – 0.45 pt (0.15 mm);
from 25 to 49% – 0.3 pt (0.1 mm);
from 50 to 100% – 0.2 pt (0.07 mm).
If you do not meet these requirements, there is a high probability of losing thin-line elements during their reproduction.
Depending on the color of the text, the minimum font size should be:
for chopped headsets – 6 pt (CMYK), 4 pt (monochrome color);
for detected headsets – 7 pt (CMYK), 5 pt (monochrome color);
reversible for chopped headsets – 7 pt (CMYK), 5 pt (monochrome color);
inverted for detected headsets – 8 pt (CMYK), 6 pt (monochrome color).
It is not always possible to monitor the presence of elements that do not meet the above parameters, especially at the stage of prepress layout. Often this error appears only when printing a print run. And the correction of such “blunders” found on the device, entails the inevitable cost of re-outputting the forms and adjustment of equipment, and can also cause changes in the timing of delivery of finished products.
6. Fonts
Fonts used in the layout must be embedded in the provided file. If there is no font in the layout, it is automatically replaced by Courier. It is also not recommended to use system fonts, because when processing files on a raster processor there is a high probability of their replacement.
7. Color
Layout should not contain objects other than CMYK color space. PANTONE® blended colors are allowed. In 4-color work (CMYK) mixed shades must be converted to CMYK. Standard PANTONE® palette libraries must be used to define mixed colors.
Black elements (CMYK-0/0/0/100), located on a uniform background, must have the attribute “overprint” (overlay).
It is not recommended to have gray items prepared from 2, 3 or 4 colors. Spot colors need to be prepared with the smallest CMYK components to ensure more accurate color reproduction. Gray should only be obtained from Black. Otherwise, there may be “differences” in circulation.
Black dies that require a rich, deep black color should be assigned a CMYK ratio of 60/50/40/100. In case of non-compliance with these requirements and preparation of black dies with a different composition according to CMYK, the resulting black can transmit shades of other colors.
The total color of the images should not exceed 300%. Otherwise, the effects of “fading” (shading), non-processing of elements in the shadows and “plucking” of paper fibers during printing may occur.
8. File requirements, profiles
You must turn off the color management system when writing a PS file in the print dialog box. If there are color profiles in the file, the raster processor automatically deletes them.
The printing equipment of the VAITE printing house, as well as the color sample are adjusted in accordance with the ISO 12647-2 standard.
The PDFs provided must be obtained from Acrobat Distiller via a PS file, as required by the printer. You can request additional settings profile for Acrobat Distiller.
9. Raster images
The picture resolution for bitmaps is 300 dpi. The standard print line is 200 lpi for coated paper and 175 lpi for non-coated paper. A resolution higher than 400 dpi does not affect the image quality, but it significantly slows down the process of preparing PS / PDF files and processing them on a raster processor, so images with a resolution higher than 400 dpi are automatically reduced to 300 dpi.
All images used in the layout must be presented in the color model “CMYK”! Images in color space “RGB”, “LAB”, etc. are not allowed. Black and white images must be prepared as “Grayscale”. Bar images are like “Bitmap” and have a resolution of 1200 dpi. It is not allowed to use raster text less than 8 points, especially prepared in reverse and from 2 to 4 colors.
When using the * .JPEG format for bitmap images, keep in mind that the degree of compression is achieved by losing image quality.
The use of * .GIF, * .BMP, * .PICT formats, as well as images placed in the layout via the “clipboard” is not allowed.
10. Layout requirements
The layout is printed directly in the printing house. The layout is approved by the customer after the customer views the printed sheets in the office or by viewing the viewed files over the Internet.
Confirmation of the correctness and conformity of the layout is the dated signature of the customer on each sheet of the printed original or approved by e-mail electronic layout sent by the customer via the Internet / FTP.
To view PDFs, use Adobe Reader version 7 (www.adobe.com) or Adobe Acrobat Professional version 7. Sighting is possible only if the Overprint Preview function is enabled.
To print documents on an Adobe Acrobat Professional printer, turn on the Simulate Overprinting feature in the print settings.
Adobe Reader does not support this feature.
Only then will you see the items that appear on the printout.
11. Color Sample Requirements
A digital color sample made on special equipment calibrated according to the printing process is used to control the quality of the color separation and as a reference point for the color for the printer. Fingerprints from a printer or digital machine cannot be a color standard!
Color sample files must match the files provided for printing.
12. Post-press
Electronic models of covers for publications that are fastened with adhesive seamless and thread-sewing methods are provided in the form of spreads that take into account the size of the root.
The thickness of the root for a particular publication is calculated based on the number of notebooks and the density of the paper used. The size of the root can be clarified with the printing manager.
The back of the cover cover should be white and have an additional 2 mm on each side for a stronger connection between the cover unit and the cover.
When assembling the products that are fastened to the bracket, the internal columns of the block are reduced by shifting the columns by an amount that depends on the thickness of the block of the brochure in expanded form. The need for compensation for displacement (dissolution of columns) is determined by the specialists of the printing house.
When assembling spring-loaded products, the distance from the edge of the sheet (in edged format) to the inner edge of the spring holes must be taken into account. The proposed distance is 9 mm.
