mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-12-26 06:56:45 +01:00
139 lines
7.2 KiB
Text
139 lines
7.2 KiB
Text
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 Bezier 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 utilize 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 7.0.11-* series. It runs on Linux,
|
|
Windows, Mac Os X, iOS, Android OS, and others.
|
|
|
|
The authoritative ImageMagick web site is https://imagemagick.org. The
|
|
authoritative source code repository is
|
|
https://github.com/ImageMagick/ImageMagick.
|
|
|
|
We continue to maintain the legacy release of ImageMagick, version 6,
|
|
at https://legacy.imagemagick.org.
|
|
|
|
|
|
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 elliptical.
|
|
* 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.
|
|
* Bilateral blur: non-linear, edge-preserving, and noise-reducing
|
|
smoothing filter.
|
|
* 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 * https://legacy.imagemagick.org/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 @
|
|
http://www.fmwconcepts.com/imagemagick/: 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 best practices strongly encourages you to configure a security
|
|
policy that suits your local environment.
|
|
|
|
Now that ImageMagick version 7 is released, we continue
|
|
to maintain the legacy release of ImageMagick, version 6, at
|
|
https://legacy.imagemagick.org. Learn how ImageMagick version 7 differs
|
|
from previous versions with our porting guide.
|
|
|
|
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;
|
|
* reduce lock contention with the tcmalloc memory allocation library;
|
|
* 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 HDRI. If you disable HDRI, you use
|
|
half the memory and instead of predominately floating point operations,
|
|
you use the typically more efficient integer operations. The tradeoff
|
|
is reduced precision and you cannot process out of range pixel values
|
|
(e.g. negative). If you build the Q8 non-HDRI version of ImageMagick,
|
|
you again reduce the memory requirements in half-- and once again there
|
|
is a tradeoff, even less precision and no out of range pixel values. For
|
|
a Q8 non-HDRI build of ImageMagick, use these configure script options:
|
|
--with-quantum-depth=8 --disable-hdri.
|