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GIMP
GIMP
( /ɡɪmp/ GHIMP) ( GNU
GNU
Image Manipulation Program) is a free and open-source raster graphics editor[6] used for image retouching and editing, free-form drawing, converting between different image formats, and more specialized tasks. GIMP
GIMP
is released under GPLv3+ licenses and is available for Linux, macOS, and Microsoft Windows.

Contents

1 History 2 Development

2.1 User interface 2.2 Libre Graphics Meetings

3 Distribution

3.1 Sourceforge controversy

4 Professional reviews 5 Mascot 6 Features 7 Forks and derivatives

7.1 Notable extensions

8 See also 9 References 10 Further reading 11 External links

History[edit] Main article: GIMP
GIMP
version history GIMP
GIMP
was originally released as the General Image Manipulation Program.[7] In 1995 Spencer Kimball and Peter Mattis
Peter Mattis
began developing GIMP
GIMP
as a semester-long project at the University of California, Berkeley for the eXperimental Computing Facility. In 1996 GIMP
GIMP
(0.54) was released as the first publicly available release.[8][9] In the following year Richard Stallman
Richard Stallman
visited UC Berkeley where Spencer Kimball and Peter Mattis
Peter Mattis
asked if they could change General to GNU (the name given to the operating system created by Stallman).[10] Richard Stallman
Richard Stallman
approved and the definition of the acronym GIMP
GIMP
was changed to be the GNU
GNU
Image Manipulation Program. This reflected its new existence as being developed as Free Software as a part of the GNU Project.[11] The number of computer architectures and operating systems supported has expanded significantly since its first release. The first release supported UNIX systems, such as Linux, SGI IRIX
IRIX
and HP-UX.[7][12] Since the initial release, GIMP
GIMP
has been ported to many operating systems, including Microsoft Windows
Microsoft Windows
and macOS; the original port to the Windows 32-bit platform was started by Finnish programmer Tor M. Lillqvist (tml) in 1997 and was supported in the GIMP
GIMP
1.1 release.[12] Following the first release GIMP
GIMP
was quickly adopted and a community of contributors formed. The community began developing tutorials, artwork and shared better work-flows and techniques.[13] A GUI toolkit called GTK ( GIMP
GIMP
tool kit) was developed to facilitate the development of GIMP. GTK was replaced by its successor GTK+
GTK+
after being redesigned using object-oriented programming techniques. The development of GTK+
GTK+
has been attributed to Peter Mattis
Peter Mattis
becoming disenchanted with the Motif toolkit GIMP
GIMP
originally used; Motif was used up until GIMP
GIMP
0.60.[9][14]

Development[edit] GIMP
GIMP
is primarily developed by volunteers as a free software project associated to both the GNU
GNU
and GNOME
GNOME
Projects. Development takes place in a public git source code repository,[15] on public mailing lists and in public chat channels on the GIMPNET IRC network.[16] New features are held in public separate source code branches and merged into the main (or development) branch when the GIMP
GIMP
team is sure they won't damage existing functions.[15] Sometimes this means that features that appear complete do not get merged or take months or years before they become available in GIMP. GIMP
GIMP
itself is released as source code. After a source code release installers and packages are made for different operating systems by parties who might not be in contact with the maintainers of GIMP. The version number used in GIMP
GIMP
is expressed in a major-minor-micro format, with each number carrying a specific meaning: the first (major) number is incremented only for major developments (and is currently 2). The second (minor) number is incremented with each release of new features, with odd numbers reserved for in-progress development versions and even numbers assigned to stable releases; the third (micro) number is incremented before and after each release (resulting in even numbers for releases, and odd numbers for development snapshots) with any bug fixes subsequently applied and released for a stable version. Each year GIMP
GIMP
applies for several positions in the Google
Google
Summer of Code (GSoC);[17][18] to date GIMP
GIMP
has participated in all years except 2007.[19] From 2006 to 2009 there have been nine GSoC projects that have been listed as successful,[17] although not all successful projects have been merged into GIMP
GIMP
immediately. The healing brush and perspective clone tools and Ruby bindings were created as part of the 2006 GSoC and can be used in version 2.8.0 of GIMP, although there were three other projects that were completed and are later available in a stable version of GIMP; those projects being Vector Layers (end 2008 in 2.8 and master),[20] and a JPEG 2000
JPEG 2000
plug-in (mid 2009 in 2.8 and master).[21] Several of the GSoC projects were completed in 2008, but have been merged into a stable GIMP
GIMP
release later in 2009 to 2014 for Version 2.8.xx and 2.9.x. Some of them needed some more code work for the master tree. Second public Development 2.9-Version was 2.9.4 with many deep improvements after initial Public Version 2.9.2 [22][23] Third Public 2.9-Development version is Version 2.9.6.[24] One of the new features is removing the 4GB size limit of XCF file.[25][26] Increase of possible threads to 64 is also an important point for modern parallel execution in actual AMD Ryzen and Intel Xeon processors. Actual Version is 2.9.8 with many bugfixes and improvements in gradients and clips.[27] Next stable versions in roadmap are 2.10 with full GEGL
GEGL
and 3.0 with GTK3-Port.[28] User interface[edit] The user interface of GIMP
GIMP
is designed by a dedicated design and usability team. This team was formed after the developers of GIMP signed up to join the OpenUsability project.[29] A user interface brainstorming group has since been created for GIMP,[30][31] where users of GIMP
GIMP
can send in their suggestions as to how they think the GIMP
GIMP
user interface could be improved. GIMP
GIMP
is presented in two forms, single and multiple window mode;[32] GIMP
GIMP
2.8 defaults to the multiple window mode. In multiple window mode a set of windows contain all GIMPs functionality. By default, tools and tool settings are on the left and other dialogues are on the right.[33] A layers tab is often to the right of the tools tab, and allows a user to work individually on separate image layers. Layers can be edited by right-clicking on a particular layer to bring up edit options for that layer. The tools tab and layers tab are the most common dockable tabs. Libre Graphics Meetings[edit] Main article: Libre Graphics Meeting The Libre Graphics Meeting
Libre Graphics Meeting
(LGM) is a yearly event where developers of GIMP
GIMP
and other projects meet up to discuss issues related to free and open source graphics software. The GIMP
GIMP
developers hold birds of a feather (BOF) sessions at this event. Distribution[edit] The current version of GIMP
GIMP
works with numerous operating systems, including Linux, macOS and Microsoft Windows. Many Linux
Linux
distributions include GIMP
GIMP
as a part of their desktop operating systems, including Fedora and Debian. The GIMP
GIMP
website links to binary installers compiled by Jernej Simončič for the platform.[34] MacPorts
MacPorts
was listed as the recommended provider of Mac builds of GIMP,[35] but this is no longer needed as version 2.8.2 and later run natively on macOS.[36] GTK+
GTK+
was originally designed to run on an X11 server. Because macOS can optionally use an X11 server, porting GIMP
GIMP
to macOS is simpler compared to creating a Windows port. GIMP
GIMP
is also available as part of the Ubuntu noroot package from the Google
Google
Play Store on Android.[37] In November 2013, GIMP
GIMP
removed its download from SourceForge, citing misleading download buttons that potentially confuse customers, as well as SourceForge's own Windows installer, which bundles potentially unwanted programs. In a statement, GIMP
GIMP
called SourceForge
SourceForge
a once "useful and trustworthy place to develop and host FLOSS applications" that now faces "a problem with the ads they allow on their sites ..."[38][39][40] Sourceforge controversy[edit] Main article: SourceForge
SourceForge
§ Project hijackings and bundled malware GIMP, who discontinued their use of SourceForge
SourceForge
as a download mirror in November 2013,[38][41] reported in May 2015 that SourceForge
SourceForge
was hosting infected versions of their Windows binaries on their Open Source Mirror directory.[42][43] Professional reviews[edit] GIMP's fitness for use in professional environments is regularly reviewed; it is often compared to and suggested as a possible replacement for Adobe Photoshop.[44][45] GIMP
GIMP
has similar functionality to Photoshop, but has a different user interface.[46] GIMP
GIMP
2.6 was used to create nearly all of the art in Lucas the Game, an independent video game by developer Timothy Courtney. Courtney started development of Lucas the Game in early 2014, and the video game was published in July 2015 for PC and Mac. Courtney explains GIMP is a powerful tool, fully capable of large professional projects, such as video games. This is the first case of GIMP
GIMP
having played a major role in the production of a published video game.[47] The single-window mode introduced in GIMP
GIMP
2.8 was reviewed in 2012 by Ryan Paul of Ars Technica, who noted that it made the user experience feel "more streamlined and less cluttered."[48] Michael Burns, writing for Macworld
Macworld
in 2014, described the single-window interface of GIMP 2.8.10 as a "big improvement".[49] In his review of GIMP
GIMP
for ExtremeTech
ExtremeTech
in October 2013, David Cardinal noted that GIMP's reputation of being hard to use and lacking features has "changed dramatically over the last couple years", and that it was "no longer a crippled alternative to Photoshop". He described GIMP's scripting as one of its strengths, but also remarked that some of Photoshop's features - such as Text, 3D commands, Adjustment Layers and History - are either less powerful or missing in GIMP. Cardinal favorably described the UFRaw
UFRaw
converter for raw images used with GIMP, noting that it still "requires some patience to figure out how to use those more advanced capabilities". Cardinal stated that GIMP
GIMP
is "easy enough to try" despite not having as well developed documentation and help system as those for Photoshop, concluding that it "has become a worthy alternative to Photoshop for anyone on a budget who doesn’t need all of Photoshop’s vast feature set".[50] Mascot[edit] Wilber is the official GIMP
GIMP
mascot. Wilber has relevance outside of GIMP
GIMP
as a racer in SuperTuxKart
SuperTuxKart
and was displayed on the Bibliothèque nationale de France (National Library of France) as part of Project Blinkenlights.[51][52][53] Wilber was created at some time before 25 September 1997 by Tuomas Kuosmanen (tigert) and has since received additional accessories and a construction kit to ease the process.[54]

Features[edit] Further information: Comparison of raster graphics editors

Animation Showing Brushes, Patterns, Gradients Created in GIMP

Tools used to perform image editing can be accessed via the toolbox, through menus and dialogue windows. They include filters and brushes, as well as transformation, selection, layer and masking tools.

Color

There are several ways of selecting colors, including palettes, color choosers and using an eyedropper tool to select a colour on the canvas. The built-in color choosers include RGB/HSV selector or scales, water-color selector, CMYK selector and a color-wheel selector. Colors can also be selected using hexadecimal color codes as used in HTML
HTML
color selection. GIMP
GIMP
has native support for indexed colour and RGB color spaces; other color spaces are supported using decomposition where each channel of the new color space becomes a black-and-white image. CMYK, LAB and HSV (hue, saturation, value) are supported this way.[55][56] Color blending can be achieved using the Blend tool, by applying a gradient to the surface of an image and using GIMP's color modes. Gradients are also integrated into tools such as the brush tool, when the user paints this way the output color slowly changes. There are a number of default gradients included with GIMP; a user can also create custom gradients with tools provided. Gradient plug-ins are also available.

Selections and paths

GIMP
GIMP
selection tools include a rectangular and circular selection tool, free select tool, and fuzzy select tool (also known as magic wand). More advanced selection tools include the select by color tool for selecting contiguous regions of color—and the scissors select tool, which creates selections semi-automatically between areas of highly contrasting colors. GIMP
GIMP
also supports a quick mask mode where a user can use a brush to paint the area of a selection. Visibly this looks like a red colored overlay being added or removed. The foreground select tool is an implementation of Simple Interactive Object Extraction (SIOX) a method used to perform the extraction of foreground elements, such as a person or a tree in focus. The Paths Tool allows a user to create vectors (also known as Bézier curves). Users can use paths to create complex selections, including around natural curves. They can paint (or "stroke") the paths with brushes, patterns, or various line styles. Users can name and save paths for reuse.

Image editing

There are many tools that can be used for editing images in GIMP. The more common tools include a paint brush, pencil, airbrush, eraser and ink tools used to create new or blended pixels. The Bucket Fill tool can be used to fill a selection with a color or pattern. The Blend tool can be used to fill a selection with a color gradient. These color transitions can be applied to large regions or smaller custom path selections. GIMP
GIMP
also provides "smart" tools that use a more complex algorithm to do things that otherwise would be time consuming or impossible. These include:

Clone tool, which copies pixels using a brush Healing brush, which copies pixels from an area and corrects tone and color Perspective clone tool, which works like the clone tool but corrects for distance changes Blur and sharpen tool blurs and sharpens using a brush The Smudge tool can be used to subtly smear a selection where it stands. Dodge and burn tool is a brush that makes target pixels lighter (dodges) or darker (burns)

Animation showing three docked and tabbed dialogs: layers, channels, and paths.

Layers, layer masks and channels

An image being edited in GIMP
GIMP
can consist of many layers in a stack. The user manual suggests that "A good way to visualize a GIMP
GIMP
image is as a stack of transparencies," where in GIMP
GIMP
terminology, each transparency is a layer.[57] Each layer in an image is made up of several channels. In an RGB image, there are normally 3 or 4 channels, each consisting of a red, green and blue channel. Color sublayers look like slightly different gray images, but when put together they make a complete image. The fourth channel that may be part of a layer is the alpha channel (or layer mask). This channel measures opacity where a whole or part of an image can be completely visible, partially visible or invisible. Each layer has a layer mode that can be set to change the colors in the image.[58] Text layers can be created using the text tool, allowing a user to write on an image. Text layers can be transformed in several ways, such as converting them to a path or selection.[59][60]

Droste effect
Droste effect
using Mathmap plug-in

Automation, scripts and plug-ins

GIMP
GIMP
has approximately 150 standard effects and filters, including Drop Shadow, Blur, Motion Blur and Noise. GIMP
GIMP
operations can be automated with scripting languages. The Script-Fu is a Scheme-based language implemented using a TinyScheme interpreter built into GIMP.[61] GIMP
GIMP
can also be scripted in Perl,[62][63] Python (Python-Fu),[64][65] or Tcl, using interpreters external to GIMP.[66] New features can be added to GIMP
GIMP
not only by changing program code ( GIMP
GIMP
core), but also by creating plug-ins. These are external programs that are executed and controlled by the main GIMP
GIMP
program.[67][68] MathMap is an example of a plug-in written in C. There is support for several methods of sharpening and blurring images, including the blur and sharpen tool. The unsharp mask tool is used to sharpen an image selectively — it only sharpens areas of an image that are sufficiently detailed. The Unsharp Mask tool is considered to give more targeted results for photographs than a normal sharpening filter.[69][70] The Selective Gaussian Blur tool works in a similar way, except it blurs areas of an image with little detail.

GEGL

The Generic Graphics Library (GEGL) was first introduced as part of GIMP
GIMP
on the 2.6 release of GIMP. This initial introduction does not yet exploit all of the capabilities of GEGL; as of the 2.6 release, GIMP
GIMP
can use GEGL
GEGL
to perform high bit-depth color operations; because of this less information is lost when performing color operations.[71] When GEGL
GEGL
is fully integrated, GIMP
GIMP
will have a higher color bit depth and better non-destructive work-flow. Current distribution versions of GIMP
GIMP
only support 8-bit of color, which is much less than what e.g. digital cameras produce (12-bit or more). Full support for high bit depth is included with actual Gimp 2.9 Development version. For accelerations OpenCL is available for some operations.[72]

File
File
formats

GIMP
GIMP
supports importing and exporting with a large number of different file formats,[73] GIMP's native format XCF is designed to store all information GIMP
GIMP
can contain about an image; XCF is named after the eXperimental Computing Facility where GIMP
GIMP
was authored. Import and export capability can be extended to additional file formats by means of plug-ins.

  File
File
formats

Import and export GIMP
GIMP
has import and export support for image formats such as BMP, JPEG, PNG, GIF
GIF
and TIFF, along with the file formats of several other applications such as Autodesk
Autodesk
flic animations, Corel PaintShop Pro images, and Adobe Photoshop
Adobe Photoshop
documents. Other formats with read/write support include PostScript
PostScript
documents, X bitmap image, xwd, and Zsoft PCX. GIMP
GIMP
can also read and write path information from SVG files and read/write ICO Windows icon files.

Import only GIMP
GIMP
can import Adobe PDF documents and the raw image formats used by many digital cameras, but cannot save to these formats. An open source plug-in, UFRaw, adds full raw compatibility, and has been noted several times for being updated for new camera models quicker than Adobe's UFRaw
UFRaw
support.

Export only GIMP
GIMP
can export to MNG layered image files ( Linux
Linux
version only) and HTML
HTML
(as a table with colored cells), C source code files (as an array) and ASCII Art (using a plug-in to represent images with characters and punctuation making up images), though it cannot read these formats.

Forks and derivatives[edit] Because of the free and open-source nature of GIMP, several forks, variants and derivatives of the computer program have been created to fit the needs of their creators. While GIMP
GIMP
is available for popular operating systems, variants of GIMP
GIMP
may be OS-specific. These variants are neither hosted nor linked on the GIMP
GIMP
site. The GIMP
GIMP
site does not host GIMP
GIMP
builds for Windows or Unix-like operating systems either, although it does include a link to a Windows build. Well-known variants include:

CinePaint: Formerly Film Gimp, it is a fork of GIMP
GIMP
version 1.0.4, used for frame-by-frame retouching of feature film. CinePaint
CinePaint
supports up to 32-bit IEEE-floating point color depth per channel, as well as color management and HDR. CinePaint
CinePaint
is used primarily within the film industry due mainly to its support of high-fidelity image formats. It is available for BSD, Linux, and macOS. GIMP
GIMP
classic: A patch[74] against GIMP
GIMP
v2.6.8 source code created to undo changes made to the user interface in GIMP
GIMP
v2.4 through v2.6. A build of GIMP
GIMP
classic for Ubuntu is available.[75] As of March 2011, a new patch could be downloaded that patches against the experimental GIMP
GIMP
v2.7. GIMP
GIMP
Portable: A portable version of GIMP
GIMP
for Microsoft Windows
Microsoft Windows
XP or later that preserves brushes and presets between computers[76] GIMPshop: Derivative that aim to replicate the Adobe Photoshop
Adobe Photoshop
in some form.[citation needed] Development of GIMPshop
GIMPshop
was halted in 2006 and the project disavowed by the developer, Scott Moschella, after an unrelated party registered "GIMPshop" as part of an Internet domain name and passed off the website as belonging to Moschella while accepting donations and making revenue from advertising but passing on none of the income to Moschella GimPhoto: In Tradition of GIMPshop
GIMPshop
stands GimPhoto,[77] which is also with GUI like Photoshop. With tool GimPad some more modifications are possible. Actual Version of GimPhoto is 24.1 with installer for Windows 8.1 and also included for Windows 7 and 10. It is based on previous Version 1.4.3 by Old GIMP
GIMP
2.4.3. in 2008. LinuxVersion is also based on Gimp 2.4.3 and have Files for Ubuntu 14, Fedora and a universal Source for other Unix
Unix
and Linux. For Mac OS X 10.6+ is Version 26.1 available based by Gimp-Version 2.6.8.[78] Only one Developer is on work in this project actual, so fast updates and new versions based on Gimp 2.8.2x or 2.9.x are not in pipe.

Instrumented GIMP
GIMP
(ingimp): Created at the University of Waterloo
University of Waterloo
to track and report user interaction with the program to generate statistics about how GIMP
GIMP
is used, first released on 5 May 2007. Statistics collected by ingimp were publicly available freely of charge on the project's site after being anonymized.[79] The ingimp site is no longer functioning as of 2014.

Notable extensions[edit]

An animated GIF
GIF
generated by GAP plugin

GIMP
GIMP
Animation Package (GAP) A GIMP
GIMP
plug-in for creating animations. GAP can save animations in several formats, including GIF
GIF
and AVI.[80] The animation function relies on GIMP's layering and image file name numbering capability. Animations are created either by placing each frame on its own layer (in other words, treating each layer as an animation cel), or by manipulating each numbered file as if it were a frame in the video: moving, rotating, flipping, changing colors, applying filters, etc. to the layers by taking advantage of interpolation within function calls(plug-in usage), within a specified frame range. The resulting project can be saved as an animated GIF
GIF
or encoded video file. GAP also provides programmed layer transitions, frame rate change, and move paths, allowing the creation of sophisticated animations. GIMP
GIMP
Paint Studio (GPS) A collection of brushes and accompanying tool presets, aimed at artists and graphic designers. It speeds up repetitive tasks and can save tool settings between sessions.[81] Resynthesizer A set of plugins originally developed as part of Paul Harrison's PhD thesis[82] providing "context-aware fill" features, including heal selection, heal transparency, uncrop and general resynthesize (the other plugins are user-friendly specialisations of this plugin). The plugin is now maintained by Lloyd Konneker.[83][84] Some uses for the plugin are creating more of a texture, including creation of tileable textures, removing objects from images for touching up photos, and creating themed images. See also[edit]

Computer science portal Free software
Free software
portal

About GIMP

GIMP
GIMP
version history Libre Graphics Meeting List of computing mascots Category:Computing mascots

About editing

Image editing Comparison of raster graphics editors List of raster graphics editors

References[edit]

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GIMP
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GIMP
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changelog, see 0.6". Mac.softpedia.com. Retrieved 18 June 2012.  ^ "Gallery of WarMUX characters, which features Wilbur". Wormux.org. Archived from the original on 15 June 2012. Retrieved 18 June 2012.  ^ "Wilber". Archived from the original on 29 September 2007. Retrieved 29 September 2007. CS1 maint: BOT: original-url status unknown (link) on the Bibliothèque nationale de France ^ GIMP
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— linking to us. For Wilber kit see /docs/Wilber_Construction_Kit.xcf.gz ^ Yamakawa, Yoshinori (6 January 2007). "Separate+". cue.yellowmagic.info. Archived from the original on 7 January 2007. Retrieved 2 July 2009.  ^ "Decompose". GIMP
GIMP
user manual. Retrieved 2 July 2009.  ^ "Introduction to layers". GIMP
GIMP
user manual. Retrieved 2 July 2009.  ^ "Layer Modes". GIMP
GIMP
user manual. Retrieved 2 July 2009.  ^ "Paths and Text". GIMP
GIMP
manual. Retrieved 16 February 2014.  ^ "Text and Fonts". GIMP
GIMP
manual. Retrieved 5 July 2009.  ^ "Using Script-Fu Scripts". gimp.org website. Retrieved 26 May 2014.  ^ " GIMP
GIMP
– Basic Perl". gimp.org website. Retrieved 26 May 2014.  ^ " GIMP
GIMP
Perl
Perl
source". GNOME
GNOME
git repository. Retrieved 26 May 2014.  ^ " GIMP
GIMP
Python Documentation". gimp.org website. Retrieved 26 May 2014.  ^ " GIMP
GIMP
Python source". GNOME
GNOME
git repository. Retrieved 26 May 2014.  ^ "Gimp Client". wiki.tcl.tk website. Retrieved 26 May 2014.  ^ "Plug-In Development". gimp.org website. Retrieved 26 May 2014.  ^ "Earl Oliver, Jaime Ruiz, Steven She, and Jun Wang, The Software Architecture of the GIMP, December 2006". Citeseerx.ist.psu.edu. 4 December 2006. Retrieved 18 June 2012.  ^ "Sharpening — Unsharp Mask". www.scantips.com. Retrieved 8 August 2009.  ^ "Unsharp Mask". GIMP
GIMP
manual. Archived from the original on 2 May 2006. Retrieved 8 August 2009.  ^ " GIMP
GIMP
2.6 Release Notes". gimp.org. Retrieved 2 July 2009.  ^ http://wiki.gimp.org/wiki/Hacking:Porting_filters_to_GEGL ^ " File
File
formats supported by the GIMP". gimphelp.org. 2007. Archived from the original on 30 August 2009. Retrieved 2 July 2009.  ^ Hartshorn, Peter. "gimp-classic". sourceforge.net. Dice. Retrieved 21 December 2013.  ^ Robinson, Alastair M. "GIMP-classic". launchpad.net. Canonical. Retrieved 23 March 2010.  ^ Haller, John T. (22 March 2009). " GIMP
GIMP
Portable". PortableApps.Com. Rare Ideas. Retrieved 2 July 2009.  ^ Website of GimPhoto. In: gimphoto.com. ^ http://www.gimphoto.com/2011/08/gimphoto-261-for-osx-released-wakatobi.html ^ Ingimp website via Internet Archive ^ Steiner, Jakub. "Advanced Animations Tutorial". GIMP
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user manual. Retrieved 2 July 2009.  ^ " GIMP
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Developers. Google. Retrieved 2 July 2009.  ^ Harrison, Paul (2005). Image Texture Tools (Ph.D. thesis). Monash University.  ^ "bootchk/resynthesizer". GitHub. Retrieved 2017-01-02.  ^ "Resynthesizer". www.logarithmic.net. Retrieved 2017-01-02. 

Further reading[edit]

Montabone, Sebastian (2010). Beginning Digital Image Processing: Using Free Tools for Photographers. Berkeley, California: Apress. ISBN 978-1-4302-2841-7.  Peck, Akkana (16 December 2008). Beginning GIMP: From Novice to Professional (2nd ed.). Berkeley, California: Apress. ISBN 978-1-4302-1070-2.  Bunks, Carey (15 February 2000). Grokking the GIMP. Indianapolis, Indiana: New Riders Press. ISBN 978-0-7357-0924-9. Retrieved 21 December 2013. [permanent dead link] Lecarme, Olivier; Delvare, Karine (January 2013). The Book
Book
of GIMP. San Francisco, California: No Starch Press. ISBN 978-1-59327-383-5. Retrieved 7 March 2014. 

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