World Library  
Flag as Inappropriate
Email this Article

Gegl

Article Id: WHEBN0000036781
Reproduction Date:

Title: Gegl  
Author: World Heritage Encyclopedia
Language: English
Subject: Non-destructive editing, Beta software, GIMP
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Gegl

GEGL
Initial release 2000 (2000)
Stable release 0.2.0 / 2 April 2012 (2012-04-02)
Development status Beta
Written in C
Operating system Cross-platform
Type Image processing library
License GNU Lesser General Public License
Website .org.geglwww

The Generic Graphics Library (GEGL) is a programming library under development for image processing applications. It is mainly developed for GIMP in order to bring support for higher bit depth images than GIMP currently supports, as well as non-destructive editing. It has been partially implemented in GIMP 2.6,[1] will be used directly in 2.10, [2] and may be used by other software too.

Historically, the GEGL mascot, a five-legged goat created by George (Jiří) Lebl,[3] found life as an easter egg in GNOME desktops.[4]

GEGL design

GEGL is modelled after a directed acyclic graph, where each node represents an image operation (called "operators" or "ops"), and each edge represents an image. Operations can in general take several input images and give several output images, which corresponds to having several incoming edges (images) and several outgoing edges (images) at a given node (operation). The system uses an on-demand model, doing work only as required.

Using an on-demand model allows features such as having very quick previews while editing, and once the user has finished making changes GEGL will repeat the same operations in full resolution for the final image in the background.

GEGL operators

An operator (op) is a node within a GEGL graph responsible for one action; ops can be:

  • simple, such as "add" (taking two inputs) or "premultiply by alpha" (taking one input)
  • complex, such as colorspace conversions

babl

babl, a support library for GEGL, provides a generic way to deal with color-space conversions;[5] babl operates abstracting the fundamental color operations so that GEGL need not be aware of them. Through babl, GEGL provides an optimized and powerful (optionally with SIMD support) treatment of arbitrary color data; this enables dependent applications to efficiently support a wide range of color spaces (from 8-bit RGB to full floating point CMYK) with minimal extra application-code.

OpenRaster

OpenRaster is an XML file format used for saving raster graphics. GEGL's lead developer Øyvind Kolås has helped specifying OpenRaster so that it is capable of saving a GEGL graph.

History of GEGL

Historically a GNOME easter egg, the GEGL mascot is a five-legged goat.(Genetically Engineered Goat, Large)

GEGL was originally conceived as a GIMP core replacement in 2000, finally in 2006 the external API was deemed stable enough and capable of replacing the GIMP core. On 20 December 2007, it was added to the development version of GIMP. Some of GIMP's tools have already been converted to GEGL operations; mostly tools which modify colors, brightness or contrast have been converted.

See also

References

  1. ^ "GIMP 2.6 Release". Retrieved 2008-10-01. 
  2. ^ "Gimp 2.10 announcement on Google+". Retrieved 2012-03-15. 
  3. ^ George (Jiří) Lebl (2007-12-16). "Stuff of Jiří Lebl (or George)". Retrieved 2008-03-21. I'm a big supporter of free software and if I do work on free software it is mostly on GNOME. 
  4. ^ Christian and Steve (2002-02-02). "GNOME Summary - 2002-01-20 - 2002-02-02". GNOME Developer News. Archived from the original on 2009-04-18. Retrieved 2008-03-19. Up to this point this game has been considered just another Urban Legend by the summary editors, but no more. 
  5. ^ babl website

External links

  • Official website
  • GEGL Mailing List Archives
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.