Files – Layout
CoverThe cover of a book consists of the front cover, the spine, and the back cover. A book cover needs to be mounted as a single piece, in a separate PDF print file, including bleeds and crop marks.
Crop marksCrop marks are used to indicate the trim line: that is, the line on which the cut to the finished format will be made. Crop marks are useful for the graphic designer in order to trace the edge of the paper in the finished format and thus be able to properly size the margins and to check if sufficient bleed is included in the file. We recommend a width of 0.125 inches or 3 mm for the bleed.
DensityThickness of the ink film that is applied to the paper to obtain the right color. In offset printing, the recommended density to achieve a particular colorimetric result will vary depending on the paper that is used. This is less of a problem in digital printing because the ink does not penetrate the paper.
Digital printingPrinting process that uses either 1- or 4- colour process on a digital press. In contrast to offset printing, digital printing makes it easier to print different content with each print cycle. There are mainly two digital printing processes: laser and inkjet printing. Laser printing produces high-quality text and graphics by using an electrostatic digital printing process. Inkjet printing uses nozzles that project ink drops that are directed one by one by an electrostatic field. Until now the print quality of the laser has been superior but the cost has been higher. Progress in inkjet over the past decade is promising.
Duplex (double-sided) cover printingDuplex cover printing involves printing colour on the C2 (inside front cover) and C3 (inside back cover) as well as on the C1 (front cover) and C4 (back cover).
Four-colour processAlso called quadrichromy, four-colour process is a standard printing process used for digital color reproduction. Known as CMYK, this process uses three primary colors: cyan (blue), magenta (pinkish red), and yellow. We add black to give more contrast to the images, but also to stabilize the colors (see demonstration in our article on color reproduction). This process only reproduces 50% of the colors visible to the human eye.
An advanced color separation technique invented in the 1990s by Pantone based on the use of orange and green (or blue) in addition to cyan, magenta, yellow and black. Although a more accurate method for reproducing color than standard CMYK, the technical difficulties and high operating costs associated with the hexachromic method have prevented it from becoming widespread. Today this method is all but abandoned.
ImpositionThe process whereby the pages of a print file are arranged so that they will appear in the correct order in the printed book. Imposition methods depend on the type of press being used as well as the particular printing methods adopted by the printer, and so will vary from one printer to another. Other factors which may affect the way in which imposition is done include the book’s trim size, the paper format, bleed and binding (perfect binding, hardcover, spiral, sewn, etc.). Given that the imposition method is determined by numerous factors, graphic designers should always provide their print file in pages mode, and not spreads.
LaminationThe process of applying plastic film, either matte or glossy, to the front of a book cover. It not only gives a more aesthetic appearance to the book but also protects the cover which is exposed to scratches and fingerprints.
Printing process derived from lithography, which relies on a chemical balance between water and ink. The water acts like a negative: it lets the ink settle on the cliché (aluminum plate) only in the areas where you want to print. It is the most widely used printing process in the world.
PantoneAmerican company founded in 1866 manufacturing color charts for the cosmetics industry first, then for printing from 1963 with its first Pantone Matching System (PMS) color system. Pantone shades are referenced colors that make it possible to produce a direct tint by mixing multiple colors, for example to accurately produce the color of an advertiser’s brand. The use of direct dyes in printing is expensive because it involves completely cleaning the press between runs. Pantone colors are interesting because they broaden the spectrum of colors visible to the human eye. There are now good Pantone color conversion systems in the Four Color Process (CMYK) process, however we recommend that you convert your colors to CMYK yourself, rather than leaving it to software.
RegisterPosition of pages on the recto and verso of a page that ensures proper alignment.
ReprintA reprint refers to any print order of a book title which has been printed previously and for which the printer already has the print-ready files. A reprint order is typically produced with the same files as the first print run. In certain situations, new files can be provided by the client with revisions to the text or layout.
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