rhodamine magenta
The magenta pigment that is used to make magenta ink for color process printing. This magenta ink is nearly ideal as it appears as a bluish magenta. It is higher quality and more expensive than rubine magenta.

rich black
Black with a percentage of cyan, magenta and/or yellow added to it. This is often done to avoid that black text or rectangles which partially overprint other objects appear ‘more black’ where they do. The black bar in the example below shows the problem. Rich black can also be used to print a denser, less grayish black.

Usually rich black consists of 40 C, 40 M, 40 Y and 100 K (sometimes yellow is left out). Experienced operators adapt the mixture of colors to the content of the page. On pages that have a lot of cool colors like blue in them, they use a cool rich black which mainly adds cyan to the black. On pages containing a lot of warm brown colors, a warm rich black is used which contains more magenta and yellow than cyan.

rich text
The result of adding additional information to plain text. Examples of information that can be added include font data, color, formatting information, phonetic annotations, interlinear text, and so on. The Microsoft RTF file format is probably the prevalent standard for exchanging rich text.

RIFF
Acronym for Raster Image File Format, an expanded version of TIFF that was developed by Letraset and is used primarily in its software, such as ImageStudio and ColorStudio. RIFF was designed to handle CYMK and RGB make data at a time when TIFF could not.

right reading
Reading from left to right, as opposed to wrong reading, reading from right to left.

right-reading image
An image that is viewed as ‘normal,’ i.e., reading naturally from left to right. Films are made with the image right-reading on the emulsion side (wrong reading on the base side) for letterpress and flexographic platemaking.

rigidity
Ability to follow changes in motion without lag.

RIP
Abbreviation for Raster Image Processor, a device or computer program that receives a description of the content of a page and converts it into information that can be output on paper, film, plates, slides or any other medium. Click here for more information.

RISC
Abbreviation for Reduced Instruction Set Computer, a design strategy for processors (CPUs) that uses a limited set of instructions to simplify the processor’s design so it can run at a higher speed. This is the opposite of CISC designs in which a large instruction set complicates the design of the CPU so it can only run at a (relatively speaking) lower speed. Well, that is the theory at least. In reality RISC processors funnily enough do not necessarily use a reduced set of instructions. The PowerPC processor, which is an example of a RISC design, even has a larger instruction set than the CISC-based Pentium processor. RISC designs are usually characterized by the use of short pipelines, a large set of registers and strong floating point performance.

river
An irregular “river” of white space that runs through a column of text.

RLE
Abbreviation for Run Length Encoding, a compression algorithm that replaces a number of identical bytes with 2 bytes.

RLL
Abbreviation for Run Length Limited.

RMA
Abbreviation for Return Merchandise Authorization (number)

ROFL
Abbreviation for Rolling On Floor Laughing

ROFLOL
Abbreviation for Rolling On Floor Laughing Out Loud (OK, I admit this does not have much to do with prepress)

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