Ragged left In typesetting, type that is justified along the right margin and ragged on the left.

Ragged right In typesetting, type that is justified along the left margin and ragged on the right.

Raster image processor (RIP) In digital imaging, a combination of computer software and hardware that controls the printing process by calculating the bitmaps of images and instructing a printing or platesetting device to create the images. Most PostScript systems use a hardware RIP built into the printer.

Ream Five hundred sheets of paper.

Recto The right hand page of a book.

Red, green, and blue See RGB.

Register The positioning of two or more printing images in exact alignment with each other.

Printing that is correctly positioned on the page is said to be "in register." Four-color printing is in register, for example, when all four successive colors are aligned, one on top of the other, so that they produce a single image with no color gaps or overlaps. When you can see a single color 'hanging out' underneath another, that color is out of register.

Register marks Crosses or other targets applied to original copy prior to photography. Used for positioning films in register, or for register of two or more colors in process printing.

Relative humidity (RH) The amount of water vapor present in the atmosphere expressed as a percentage of the maximum that could be present at the same temperature.

Repeatability The ability to keep photographic film and the images thereon in proper register in imagesetters, film plotters, and plate­setters. Repeatability is usually measured in micrometers.

Reprography Copying and duplicating.

Resolution Ability of an input device to record, or an output device to reproduce the fine detail of an image. There is a difference between resolution and addressability, or sampling rate. Resolution concerns how closely spots can be placed, and also whether gray levels can be distinguished. Resolution for output devices depends on addressability, bit-depth, and mark size.

Retrofit Backwards integration of advanced capability into a device or program not originally intended for that purpose.

Reverse The opposite of what you see. Type your name on a white sheet of paper in black ink. The reverse of this would be a black piece of paper with a white name.

RGB (red, green, and blue) The primary additive colors used in display devices and scanners. Commonly used to refer to the color space, mixing system, or monitor in color computer graphics.

Right-angle fold In binding, a term used for two or more folds that are at 90° angles to each other.

RIP Raster Image Processor.

River The apparent white space that is produced when poor or random word spacing is used.

Roller stripping A term denoting that the ink does not adhere to the metal ink rollers on a press.

Rub-proof An ink that has reached maximum dryness and does not mar with normal abrasion.

Runaround The term describing type set to fit around a picture or other element of the design.

Runnability Paper properties that affect the ability of the paper to run on the press.

Running footer A page number or other text repeated at the bottom of each page.

Running head A headline or title repeated at the top of each page.