Raster image processor


Raster image processor

A raster image processor (RIP) is a component used in a printing system which produces a raster image also know as a bitmap. The bitmap is then sent to a printing device for output. The input may be a page description in a high-level page description language such as PostScript, Portable Document Format, XPS or another bitmap of higher or lower resolution than the output device. In the latter case, the RIP applies either smoothing or interpolation algorithms to the input bitmap to generate the output bitmap.

Raster image processing is the process and the means of turning vector digital information such as a PostScript file into a high-resolution raster image.

Originally RIPs were a rack of electronic hardware which received the page description via some interface (eg RS232) and generated a "hardware bitmap output" which was used to enable or disable each pixel on a real-time output device such as an optical film scanner.

A RIP can be implemented either as a software component of an operating system or as a firmware program executed on a microprocessor inside a printer, though for high-end typesetting, standalone hardware RIPs are sometimes used. Ghostscript and GhostPCL are examples of software RIPs. Every PostScript printer contains a RIP in its firmware.

Earlier RIPs retained backward compatibility with photosetters so they supported the older languages. So, for example Linotype RIPs supported CORA (RIP30).

tages of RIP

# Interpretation: This is the stage where the supported PDLs (Page description languages) are translated into a private internal representation of each page. Most RIPs process pages serially so the current machine state is only for the current page; i.e one page at once. Once a page has been output the page state is discarded to ready it for the next page.
# Rendering: A process through which the private internal representation is turned into a continuous tone bitmap. Note that in practical RIPs interpretation and rendering are frequently done together. Simple languages (mostly the most ancient) were designed to work on minimal hardware so tend to "directly drive" the renderer.
# Screening: In order to print, a continuous-tone bitmap is converted into a halftone (pattern of dots). Two screening methods or types are "Amplitude Modulation" (AM) screening and "stochastic or Frequency Modulation" (FM) screening. In AM screening, dot size varies depending on object density -- tonal values; dots are placed in a fixed grid. In FM screening, dot size remains constant and dots are placed in random order to create darker or lighter areas of the image; dot placement is precisely controlled by sophisticated mathematical algorithms.

A RIP chip is used in laser printers to communicate raster images to a laser.

RIP Providers

* [http://www.embeddedgeneral.com EG-DocRIP] can interpreter several printer languages or document formats - HP PCL5, XL, Adobe PostScript Level3, Mirosoft XPS, W3C XHTML-MP, and render to raster image.

ee also

* Laser printer
* Raster graphics
* Raster to vector
* Vector graphics

External links

* [http://desktoppub.about.com/cs/rip/a/rip.htm Let 'er RIP - What you need to know about raster image processing] , from About.com


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Raster Image Processor — Raster Image Processor,   RIP …   Universal-Lexikon

  • Raster Image Processor — Ein Raster Image Processor (RIP) (deutsch Rastergrafikprozessor) ist eine spezielle Hardware oder eine Kombination aus Hardware und Software, die spezifische Daten einer höheren Seitenbeschreibungssprache, beispielsweise PostScript, PDF… …   Deutsch Wikipedia

  • Raster Image Processor — Pour les articles homonymes, voir RIP. Le Raster Image Processor (RIP en anglais) est, dans le monde des industries graphiques, l outil informatique qui permet de tramer des données afin de les rendre imprimables. Le RIP fait le lien entre des… …   Wikipédia en Français

  • Raster Image Processor — Схема работы RIP Raster Image Processor (в переводе с англ.   «обработчик растрового изображения»)  часть печатающих устройств, отвечающая за преобразование изображений в п …   Википедия

  • Raster image processor — Растровый процессор для преобразования изображения в растровую матрицу …   Краткий толковый словарь по полиграфии

  • Raster Image Processor — device that converts vector images into bit mapped images that can be printed, RIP …   English contemporary dictionary

  • raster image processor —    RIP. The software and hardware that translates a page description language (PDL) like PostScript, or graphics output into the dots to be used by an output device s print engine …   IT glossary of terms, acronyms and abbreviations

  • raster image processor — …   Useful english dictionary

  • Raster image processor (RIP) — Растровый процессор …   Краткий толковый словарь по полиграфии

  • Raster Image Processsor — Raster Image Processor Pour les articles homonymes, voir RIP. Le Raster Image Processor (RIP en anglais) est, dans le monde des industries graphiques, l outil informatique qui permet de tramer des données afin de les rendre imprimables. Le RIP… …   Wikipédia en Français


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.