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Printing Terms Q - T

Quality Control

The day-to-day operational techniques and activities that are used to fulfill requirements for quality, such as intermediate and final product inspections, testing incoming materials, and calibrating instruments used to verify product quality.


A full range of word processing, typographic, and page layout features that enables users to combine text and graphics to create high-quality publications. It has superior typographic design and color capabilities and is made for Mac and Windows by Quark Inc. This document was created in QuarkXPress.

RAID (Radient Array of Independent Disk)

A storage system that uses a proprietary controller and two or more hard disk drives to provide a high volume of online storage.

RAM (Random Access Memory)

A read/write memory, which is in the computer's main memory.


An image composed of a set of horizontal scan lines that are formed sequentially by writing each line following the previous line, particularly on a television screen or computer monitor.


The process of converting mathematical and digital information into a series of dots for the production of negative or positive film or printing plates.


The halftone screening of an existing halftone or screened copy. Re-screening is typically done when original continuous tone copy is not available. If this technique is not handled properly, it can lead to some objectionable moiré patterns in the final reproduction.


The overall agreement in the position of printing detail on a press sheet, especially the alignment of two or more overprinted colors in multicolor presswork. Register may be observed by agreement of overprinted register marks on a press sheet. In stripping, film flats are usually punched and held together with pins to ensure register.

Register Marks

Small reference patterns, guides, or crosses placed on originals before reproduction to aid in color separation and positioning of negatives for stripping. Register marks are also used to aid in color register and correct alignment of overprinted colors during printing.


Duplicating an original by any photographic or photomechanical process.


The degree of detail visible on a monitor (number of pixels) or no output (dots per inch). A measure of the finest detail visible in an image, or supported by a display device or printer. For scanned images and printers, the number of scan dots, printer dots, or halftone lines per inch is a measure of resolution.


An acronym for the Red, Green, and Blue primary colors used in computer monitors.

RGB Monitor

A color computer monitor having a design and operation based on the three additive primary colors – Red, Green and Blue.

RIP (Raster Image Processor)

A device that receives data from a Mac or PC, then converts the information according to its PostScript interpreter, then rasterizes the data (converts it to dot patterns) and then sends the rasterized data to a recording device (imagesetter) for output on photosensitive paper, film, or plates.

RLE (Run Length Encoding)

A type of data compression that reduces the size of image files by counting the occurence of identical pixels in an image and saving merely that count.

ROM (Read Only Memory)

Memory chips which cannot be modified, and can only read their contents to other memory areas.


The degree to which a chromatic color differs from a gray of the same brightness.


The sequential examination or exposure of a character or pictorial image with a moving light beam.


(1) An electronic device that uses a light beam to examine color transparencies and isolate each process color on an individual piece of film, or photographic separation, to be used in the reproduction process. (2) Flatbed electronic devices that are used in conjunction with desktop publishing systems to scan line art, logos, photographs, and typewritten or printed text supplied by the client.

Screen Angles

The mathematically correct angles of the halftone screens that are required for each of the four colors – cyan, magenta, yellow, and black – to avoid moiré patters. These angles are the following: cyan is 105 degrees, magenta is 75 degrees, yellow is 90 degrees, and black is 45 degrees.

Screen Fonts

Fonts that have been designed to display on a computer monitor.


The process of converting a continuous-tone photograph to a matrix of dots in sizes proportional to the highlights and shadows of the continuous-tone image.

SCSI (Small Computer System Interface)

The standard interface on a computer (Mac or PC) that is used for connecting peripheral devices to the computer itself.


A device on a computer network that allows networked users access to a specific service on the Internet.


The darkest portion(s) of a print or an original. In halftones, shadows have the largest dots.

Shadow Dots

The larger-sized dots in the shadow areas of a halftone.

Sheetwise Imposition

A printing layout in which separate plates (and film flats) are used to print the front and back of a single press sheet. Completely different pages appear on each side of the sheet.


One or more printed sheets folded to form a multiple page section of a book or pamphlet

Soft Dot

A dot that is poorly determined and has fuzzy edges.


A series of codes or instructions that cause the computer to perform specific functions, i.e., accounting, word processing, mail list management, etc.

Spot Color Printing

The selective addition of a non-process color ink to a printing job.


A halftoning method that creates the illusion of tones by varying the number (frequency) of the micro-sized dots (spots) in a small area. The placement of each spot is determined as a result of a complex algorithm that statistically evaluates and distributes spots under a fixed set of parameters.


A proofreader's symbol which means that any marked corrections will remain unchanged. In other words, ignore the marked corrections.


Any device-including computer memory and disks-in which data can be stored and accessed or retrieved at a later time.


The act of combining and positioning all of the copy elements from all of the film negatives or positives together as a negative for platemaking. Also known as an image assembly.


Any base material that can be printed or coated.

SWOP (Specifications for Web Offset Publications)

A set of standards for color separation films and color proofing developed for those involved in publications printing.


Removable magnetic disk.

Tape Drive

A computer peripheral or device that stores data on magnetic tape.

TCP/IP (Transmission Control Protocol/Internet Protocol)

the system that monitors and performs data transfer over the Internet. TCP sends data and IP receives it.

TIFF (Tagged Image File Format)

A standardized format that is used to store and manipulate scanned/bit-mapped files or images at varying resolutions.

Tile (Imposed Tile)

Film that has been output with pages in printer's spreads, used as part of a flat for printing.


The degree of lightness or darkness in any given area or print.

Tone Reproduction

A comparison of the density of every tone in a reproduction to the corresponding densities on the original.


(1) Printing a wet ink over a previously printed dry or wet ink film. (2) How well one color overlaps another without leaving a white space between the two or generating a third color.


Creates electronic chokes and spreads that meet professional stripper standards and is able to trap spot and process colors, hairline rules, vignettes, thin text, images, and more. It is created for either Mac or PC by the Aldus Corp.


The excess area of a printed form or page in which instructions, register marks, and quality control devices are printed. The trim is cut off before binding.

Truetype Font

A font that is a scalable outline that is based on quadratic curves, not bezier curves. Created by Apple and Microsoft, these fonts must either be converted to Type 1 before being ripped or a TrueType rasterizer must be used to create the bitmap for the output device. This conversion to Type 1 or rasterizing &hellip Continue reading


Printing two identical pages on the same press sheet, usually by exposing the same plate twice to the same negative.

Type Family

A specific style or design of type or font, i.e., Helvetica, that is available in various weights: light, condensed, medium, italic, bold, heavy, etc. Not every font family contains every weight.