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ImageMagick

ImageMagick is a collection of tools for creating, editing, viewing, composing and converting images. Many bitmap and vector-based file formats are supported.

ImageMagick is installed on the cluster’s worker nodes. It provides a number of command-line programs plus an API for programmatic control.

Command-line usage

Some of the some of the most useful included command-line programs are:

display

Display an image stored in a file:

display winterview.jpg

display -resize 800x600 winterview.jpg

Display a series of files as a slide show:

display -delay 2 *.jpg

convert

Convert an image from one format to another e.g.

convert -format tiff pic1.jpg pic1.tiff

To capture from screen to a file:

convert -format jpeg X: newpicture.jpg

animate

Create an animation effect from a set of files containing snap-shots:

animate pic1.tiff pic2.tiff pic3.tiff pic4.tiff pic5.tiff

Create an animated-gif from a series of gif files (mypics*.gif):

convert -delay 40 -loop 0 mypics*.gif myanimated.gif

Note that non-gif files should first be converted:

convert -format gif mypic1.jpg mypic1.gif

identify

View image metadata:

identify parkwood.jpg

More detailed information:

identify -verbose parkwood.jpg

More information on on these and other provided command-line tools (compare, composite, conjure, import, mogrify, montage and stream) can be found in the official ImageMagick 6 documentation.

Programmatic access (API)

There are ImageMagick APIs for most common programming languages, allowing you to script/automate your image manipulation using C++, Ruby, Perl, Python etc.

A list of ImageMagick APIs can be found on the ImageMagick 6 site. This list may not be comprehensive.

Installation notes

Version 6.7.2.7-5

This was installed on the worker nodes using the operating system’s package manager (i.e. the RPM for Centos 6.x is installed).