Concertina fold - a method of folding in which each fold opens in the opposite direction to its neighbour, giving a concertina or pleated effect.

Condensed - a style of typeface in which the characters have an elongated appearance.

Hairline rule - the thinnest rule that can be printed.

Hairlines - the thinnest of the strokes in a typeface.

Register marks: Cross-hair lines or marks on film, plates, and paper that guide strippers, platemakers, pressmen, and bindery personnel in processing a print order from start to finish.

Soft proof

Soft proof describes the simulation of the print result on a monitor.^[13] This is the cheapest solution for proofing since no additional equipment, except a monitor, is needed.

Usually soft proof is done in software applications in combination with color management systems. The monitor used for soft proofing has to be calibrated, so that the image on the screen looks like the image on the paper. The major problem is the difference of color spaces (RGB in monitor and CMYK in print) and it is solved by using ICC profiles for input and output devices. Moreover, colors on a monitor depend not only on its properties, but also on lighting conditions in a room where the image is viewed. Usually lighting is standardized and is close to a daylight (D50).

Soft proofing can be used unlimited number of times and is most useful when editing images and designing layout, but is normally not used as a contract proof.

Hard proof

Hard proof is an actual printed sample of a printed product. It is further divided into five general classifications ^[13]

Blueprint (originated from conventional platemaking) is a copy printed in one color and used for checking and correcting mistakes in contents, imposition layout and completeness of data.

Imposition proof (Layout proof) is similar to blueprint but the copy is printed in color. Imposition proof is usually done with a large-format color inkjet printer.

Color proof provides the color-reliable/color-true reproduction of the contents of the file intended for printing. Color proof is made with inkjet printers or thermal sublimation printers in combination with powerful color management systems. Proofing is performed in full-size format while in some cases small page format is also acceptable. Color proof serves as a guideline for a printing press operator and usually stands for a contract proof.

Screen Proof (True Proof) is a method of proofing used for simulating a raster structure of the printed image. Performing this proof makes it possible to recognize different raster-dependent effects such as smoothness, grade and range of tonal gradations, and moiré or rosette patterns.

Several vendors offer special proof systems for creating a screen proof. The proof is produced via color donors and thermal transfer (ablation) onto intermediate carriers or onto the substrate used for the print run. Both systems are imagesetter-like devices with which the image motifs can be reproduced in every detail including their color, screen definition, and screen angles. The true proof systems use color foils that are to be processed in separate units (laminators), transferred from intermediate carriers onto production paper and/or laminated, either to protect the proof or to give it the appearance of the surface structure of production paper.^[13]

Trim marks: Similar to crop or register marks. These marks show where to trim the printed sheet.

Fold lines are usually indicated by dashes lines either in registration or 100% magenta on a top layer. You can use a line in 100% Magenta on a top layer names "FOLD LINES (DO NOT PRINT)".

A slug is a piece of spacing material used in typesetting to space paragraphs. They are usually manufactured in strips of 6pt lead. In modern typesetting programs such as Adobe InDesign, slugs hold printing information, customized color bar information, or displays other instructions and descriptions for other information in the document. Objects (including text frames) positioned in the slug area are printed but will disappear when the document is trimmed to its final page size.

Specify printer’s marks

When you prepare a document for printing, a number of marks are needed to help the printer determine where to trim the paper, align separation films when producing proofs, measure film for correct calibration and dot density, and so on. Selecting any page-mark option expands the page boundaries to accommodate printer’s marks, bleed (the parts of text or objects that extend past the page boundary to account for slight inaccuracy when trimming), or slug area (an area outside the page and bleed that contains printer instructions or job sign-off information).

If you are setting crop marks and want the artwork to contain a bleed or slug area, make sure that you extend the artwork past the crop marks to accommodate the bleed or slug. Also make sure that your media size is large enough to contain the page and any printer’s marks, bleeds, or the slug area. If a document doesn’t fit the media, you can control where items are clipped by using the Page Position option in the Setup area of the Print dialog box.

If you select the Crop Marks option, fold marks are printed as solid lines when spreads are printed.

Print the bleed or slug areas

Specify the bleed and slug areas in the Document Setup dialog box. The bleed and slug areas are discarded when the document is trimmed to its final page size. Objects outside the bleed or slug area (whichever extends farthest) are not printed.

When printing, you can override the default location for bleed marks in the Bleed And Slug area of the Marks And Bleed area.