Radio Button

In a GUI, an option with a circular button that is either depressed or filled in with the click of a mouse to indicate that a particular selection has been made.

RAM

Acronym for Random Access Memory. 1. Semiconductor chips in a computer where information can be stored and accessed in any order. Stored memory is held as long as the system has power, or until the application requiring the storage is shut down. 2. General term used to describe the amount of memory of a computer system.

RAS

Short for Sun Rasterfile. Graphic file format compatible with Sun Microsystems’ UNIX-based computers. Files saved in this format have ".ras" as a file extension.

Raster

A grid pattern used to create bitmap images.

Recycle Bin

1. In Windows, an icon on the desktop where unwanted files are placed to be deleted. 2. Specialized folder in Windows that keeps files marked for deletion until they are either restored into the system, or deleted when the Recycle Bin is "emptied." See Trash.

Resample

Command in iPhoto Plus 1.2 imaging program used to change the actual size of an image for printing. See re-size, scale, size and zoom.

Re-size

In imaging programs, to permanently, or temporarily change the physical size of an image so that is printed or displayed larger or smaller than it was originally scanned or captured. See resample, scale, size and zoom.

Resolution

The clarity of an image on a computer display or print out generally measured in dots per inch. The more dpi, the more detailed the image.

Retouching

Use of an imaging program to clean up flaws in an image. See photo manipulation.

RGB

Acronym for Red, Green and Blue. 1. The versatile "True Color" profile, which can create any of the billions of possible, colors simply by mixing various amounts and tones of the primary colors red, green and blue. 2. General term for a device that uses True Color, such as RGB monitor. See additive primaries and true color.

Ribbon Cable

Computer connection cable with wide, flat insulation instead of round insulation. Ribbon cable is very flexible and can fit into areas with little space or with moving parts that may snag on conventional round cables. Scanners use ribbon cables to connect the circuit board to the carriage.

RTF

Acronym for Rich Text Format. A capacity of some document file formats that can retain the formatting (italics, underlines, etc.) of a document between different programs or computer platforms.