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Animated Gif to Still Images with ImageMagick - BASH - Linux
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From Wikipedia, the free encyclopedia
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ImageMagick
ImageMagick logo
Developer(s) ImageMagick Studio LLC
Stable release 6.8.9-5 / 30 June 2014; 53 days ago (2014-06-30)
Preview release 7.0.0-0 / 6 March 2014; 5 months ago (2014-03-06)
Written in C
Operating system Cross-platform
Type Image manipulation
License Apache 2.0 License
Website imagemagick.org

ImageMagick is a free and open-source[1] 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[edit]

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.

Executing:

display
...on a UNIX-like OS's command line launches the native GUI.[2]

Otherwise, images may be edited directly by various command-line parameters without launching a GUI at all. The program uses magic numbers to identify image file formats.

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,[3] 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[edit]

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[edit]

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.

Dithering[edit]

A fine control is provided for the dithering that occurs during color and shading alterations, including the ability to generate halftone dithering.

Liquid rescaling[edit]

In 2008, support for liquid rescaling was added.[4] This feature allows, for example, rescaling 4:3 images into 16:9 images without distorting the image.

Artistic effects[edit]

ImageMagick includes a variety of filters and features intended to create artistic effects:

OpenCL[edit]

ImageMagick can use OpenCL to use an accelerated graphics card (GPU) for processing.[5]

Deep color[edit]

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).

Other[edit]

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. (Applies these without generation loss on JPEG files, where possible.)
  • 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: assemble a GIF animation file from a sequence 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 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.

Distribution[edit]

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.[6]

Related software[edit]

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.[7]

See also[edit]

References[edit]

  1. ^ "ImageMagick License". ImageMagick Studio LLC. 2011. Retrieved 2011-03-16. 
  2. ^ Подскачащия Хипопотам (1 October 2006). "ImageMagick Native GUI". linux4hippos. blogspot.com. Retrieved 3 June 2013. 
  3. ^ PerlMagick, Perl API for ImageMagick
  4. ^ "ImageMagick Changelog". 
  5. ^ "ImageMagick: Architecture". Retrieved 2010-01-06. 
  6. ^ Installing Magick++
  7. ^ "Introducing GraphicsMagick Project". ImageMagick-developer Mailing List. 15 March 2003. 

Further reading[edit]

External links[edit]

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