|This article relies on references to primary sources. (August 2010)|
|Developer(s)||ImageMagick Studio LLC|
|Stable release||6.8.9-5 / 30 June 2014|
|Preview release||7.0.0-0 / 6 March 2014|
|License||Apache 2.0 License|
ImageMagick is a free and open-source software suite for displaying, converting, and editing raster image and vector image files. It can read and write over 200 image file formats. ImageMagick is licensed under the Apache 2.0 license.
The software mainly consists of a number of command-line interface utilities for manipulating images. ImageMagick does not have as robust a graphical user interface to edit images as do Adobe Photoshop and GIMP, but does include – for UNIX-like operating systems – a basic native X Window GUI (called IMDisplay) for rendering and manipulating images and API libraries for many programming languages.
...on a UNIX-like OS's command line launches the native GUI.
For a full list of formats supported, execute:
identify -list format
...via a UNIX-like OS.
A number of programs, such as Drupal, MediaWiki, phpBB, and vBulletin, can use ImageMagick to create image thumbnails if it is installed. ImageMagick is also used by other programs, such as LyX, for converting images.
ImageMagick has a fully integrated Perl API called PerlMagick, as well as many other APIs: G2F (Ada), MagickCore (C), MagickWand (C), ChMagick (Ch), ImageMagickObject (COM+), Magick++ (C++), JMagick (Java), L-Magick (Lisp), NMagick (Neko/Haxe), MagickNet (.NET), PascalMagick (Pascal), PerlMagick (Perl), MagickWand for PHP (PHP), IMagick (PHP), PythonMagick (Python), RMagick (Ruby), or TclMagick (Tcl/TK).
One of the basic and thoroughly-implemented features of ImageMagick is its ability to efficiently and accurately convert images between different file formats (it uses the command "
convert" to achieve this).
The number of colors in an image can be reduced to an arbitrary number and this is done by intelligently weighing the most prominent color values present among the pixels of the image. Note that many other image handling applications do not support a color palette of an arbitrary number of colors. If, for example, one reduces an image to 13 colors via ImageMagick, some applications will open it but some will regard it as corrupted.
A related capability is the posterization artistic effect, which also reduces the number of colors represented in an image. The difference between this and standard color quantization is that while in standard quantization the final palette is selected based upon a weighting of the prominence of existing colors in the image, posterization creates a palette of colors smoothly distributed across the spectrum represented in the image. Whereas with standard color quantization all of the final color values are ones that were in the original image, the color values in a posterized image may not have been present in the original image but are in between the original color values.
ImageMagick includes a variety of filters and features intended to create artistic effects:
The Q8 version supports up-to 8 bits-per-pixel component (8-bit grayscale, 24- or 32-bit RGB color). The Q16 version supports up-to 16 bits-per-pixel component (16-bit grayscale, up-to 48- or 64-bit RGB color).
Below are some other features of ImageMagick:
ImageMagick is cross-platform, and runs on Microsoft Windows and Unix-like systems including GNU/Linux, Mac OS X, iOS, Android, Solaris, and FreeBSD. The project's source code can be compiled for other systems, including AmigaOS 4.0 and MorphOS. It has been run under IRIX.
GraphicsMagick is a fork of ImageMagick 5.5.2 made in 2002, emphasizing the cross-release stability of the programming API and command-line options. GraphicsMagick emerged after irreconcilable differences emerged in the developers' group.
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