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Introduction to ImageMagick
ImageMagick® is a software suite to create, edit, compose, or convert
bitmap images. It can read and write images in a variety of formats (over
200) including PNG, JPEG, GIF, HEIC, TIFF, DPX, EXR, WebP, Postscript,
PDF, and SVG. Use ImageMagick to resize, flip, mirror, rotate, distort,
shear and transform images, adjust image colors, apply various special
effects, or draw text, lines, polygons, ellipses and Bézier curves.
The functionality of ImageMagick is typically utilized from the command
line or you can use the features from programs written in your favorite
language. Choose from these interfaces: G2F (Ada), MagickCore (C),
MagickWand (C), ChMagick (Ch), ImageMagickObject (COM+), Magick++ (C++),
JMagick (Java), L-Magick (Lisp), Lua, NMagick (Neko/haXe), Magick.NET
(.NET), PascalMagick (Pascal), PerlMagick (Perl), MagickWand for PHP
(PHP), IMagick (PHP), PythonMagick (Python), RMagick (Ruby), or TclMagick
(Tcl/TK). With a language interface, use ImageMagick to modify or create
images dynamically and automagically.
ImageMagick utilizes multiple computational threads to increase performance
and can read, process, or write mega-, giga-, or tera-pixel image sizes.
ImageMagick is free software delivered as a ready-to-run binary distribution
or as source code that you may use, copy, modify, and distribute in both open
and proprietary applications. It is distributed under a derived Apache 2.0
license.
The ImageMagick development process ensures a stable API and ABI. Before
each ImageMagick release, we perform a comprehensive security assessment
that includes memory error and thread data race detection to prevent
security vulnerabilities.
The current release is the ImageMagick 6.9.11-* series. It runs on Linux,
Windows, Mac Os X, iOS, Android OS, and others.
The authoritative ImageMagick version 6 web site is
https://legacy.imagemagick.org. The authoritative source code repository
is https://github.com/ImageMagick/ImageMagick6. We maintain a source code
mirror at https://gitlab.com/ImageMagick/ImageMagick6.
The design of ImageMagick is an evolutionary process, with the design and
implementation efforts serving to influence and guide further progress in
the other. With ImageMagick version 7 we aim to improve the design based
on lessons learned from the version 6 implementation.
Features and Capabilities
Here are just a few examples of what ImageMagick can do:
* Format conversion: convert an image from one format to another (e.g.
PNG to JPEG).
* Transform: resize, rotate, deskew, 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 gradients: create a gradual blend of one color whose shape is
horizontal, vertical, circular, or ellipical.
* 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.
* Computer vision: Canny edge detection.
* 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.
* Connected component labeling: uniquely label connected regions in an
image.
* Discrete Fourier transform: implements the forward and inverse DFT.
* Perceptual hash: maps visually identical images to the same or similar
hash-- useful in image retrieval, authentication, indexing, or copy
detection as well as digital watermarking.
* Complex text layout: bidirectional text support and shaping.
* 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 are OpenMP-enabled to take advantage of speed-ups
offered by multicore processor chips.
* Distributed pixel cache: offload intermediate pixel storage to one or
more remote servers.
* 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.
* ImageMagick on the iPhone: convert, edit, or compose images on your
iPhone or iPad.
Examples of ImageMagick Usage shows how to use ImageMagick from the
command-line to accomplish any of these tasks and much more. Also,
see Fred's ImageMagick Scripts: a plethora of command-line scripts that
perform geometric transforms, blurs, sharpens, edging, noise removal,
and color manipulations. With Magick.NET, use ImageMagick without having
to install ImageMagick on your server or desktop.
News
ImageMagick version 7 has been released.
ImageMagick best practices strongly encourages you to configure a security
policy that best suits your local environment.
As an analog to linear (RGB) and non-linear (sRGB) color colorspaces, as
of ImageMagick 6.9.9-29, we introduce the LinearGray colorspace. Gray is
non-linear grayscale and LinearGray is linear (e.g. -colorspace linear-gray).
Want more performance from ImageMagick? Try these options:
Add more memory to your system, see the pixel cache;
Add more cores to your system, see threads of execution support;
push large images to a solid-state drive, see large image support.
If these options are prohibitive, you can reduce the quality of the
image results. The default build is Q16. If you instead use a Q8 build,
you use half the memory The tradeoff is reduced precision. For a Q8 build
of ImageMagick, use this configure script option: --with-quantum-depth=8.