|This article relies on references to primary sources. (August 2010)|
|Developer(s)||ImageMagick Studio LLC|
|Stable release||6.8.5-6 / 10 May 2013|
|Preview release||7.0.0-0 / 22 February 2013|
|License||Apache 2.0 License|
ImageMagick is an open source software suite for displaying, converting, and editing raster image files. It can read and write over 200 image file formats. ImageMagick is licensed under the Apache 2.0 license.
Features and capabilities 
The software mainly consists of a number of command-line interface utilities for manipulating images. ImageMagick does not have a GUI-based interface to edit images, as do Adobe Photoshop and GIMP, but instead modifies existing images as directed by various command-line parameters. Nevertheless, ImageMagick also includes an X Window graphical user interface for rendering and manipulating images called IMDisplay and API libraries for many programming languages. The program uses magic numbers to identify image file formats. For a full list of formats supported, one could execute:
identify -list format.
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).
File format conversion 
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).
Color quantization 
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.
Liquid rescaling 
Artistic effects 
ImageMagick includes a variety of filters and features intended to create artistic effects:
- Charcoal Sketch Transform
Below are some other features of ImageMagick:
- Format conversion: convert an image from one format to another (e.g. PNG to JPEG).
- Transform: resize, rotate, crop, flip or trim an image.
- Transparency: render portions of an image invisible.
- Draw: add shapes or text to an image.
- Decorate: add a border or frame to an image.
- Special effects: blur, sharpen, threshold, or tint an image.
- Animation: create a GIF animation sequence from a group of images.
- Text & comments: insert descriptive or artistic text in an image.
- Image identification: describe the format and attributes of an image.
- Composite: overlap one image over another.
- Montage: juxtapose image thumbnails on an image canvas.
- Generalized pixel distortion: correct for, or induce image distortions including perspective.
- Morphology of shapes: extract features, describe shapes and recognize patterns in images.
- Motion picture support: read and write the common image formats used in digital film work.
- Image calculator: apply a mathematical expression to an image or image channels.
- Discrete Fourier transform: implements the forward and inverse DFT.
- Color management: accurate color management with color profiles or in lieu of-- built-in gamma compression or expansion as demanded by the colorspace.
- High dynamic-range images: accurately represent the wide range of intensity levels found in real scenes ranging from the brightest direct sunlight to the deepest darkest shadows.
- Encipher or decipher an image: convert ordinary images into unintelligible gibberish and back again.
- Virtual pixel support: convenient access to pixels outside the image region.
- Large image support: read, process, or write mega-, giga-, or tera-pixel image sizes.
- Threads of execution support: ImageMagick is thread safe and most internal algorithms execute in parallel to take advantage of speed-ups offered by multi-core processor chips.
- Heterogeneous distributed processing: certain algorithms are OpenCL-enabled to take advantage of speed-ups offered by executing in concert across heterogeneous platforms consisting of CPUs, GPUs, and other processors.
- Distributed pixel cache: offload intermediate pixel storage to one or more remote servers.
- ImageMagick on the iPhone: convert, edit, or compose images on your iOS computing device such as the iPhone or iPad.
ImageMagick is cross-platform, and runs on Microsoft Windows and Unix-like systems including Mac OS X, GNU/Linux, Solaris, and FreeBSD. The project's source code can be compiled for other systems, including AmigaOS 4.0 and MorphOS.
Related software 
GraphicsMagick is a fork of ImageMagick 5.5.2 made in 2002, emphasizing the cross-release stability of the programming API and user interface. GraphicsMagick emerged after irreconcilable differences emerged in the developers' group.
See also 
Further reading 
- Montabone, Sebastian (2010). Beginning Digital Image Processing: Using Free Tools for Photographers. Apress. ISBN 978-1-4302-2841-7.
|The Wikibook Knowing Knoppix has a page on the topic of: ImageMagick|
|Wikimedia Commons has media related to: ImageMagick|
- Official website
- IM Examples — Examples of CLI Usage — provides lots of small examples demonstrating its vast range of capabilities.
- Fred's ImageMagick Scripts — provides a plethora of shell scripts using ImageMagick to do more complex tasks