GraphicsMagick is a free open-source, modern, and powerful software suite for processing images. It was initially derived from ImageMagick, however, over the years, it has grown to be a fully independent project, with several improvements and additional features. It runs on all Unix-like operating systems such as Linux, and MacOS, and also runs on Windows.
It offers a useful and efficient assortment of tools as well as libraries that allow for reading, writing, and manipulating your images in more than 92 well-known formats (such as GIF, JPEG, JPEG-2000, PNG, PDF, PNM, and TIFF).
It can create a composite image in grid format, from multiple images, and create images in web-supported formats such as WEBP. It is also used to change image size, sharpen, color reduce, rotate, or add special effects to images of various formats. Importantly, it can create a GIF animation from multiple images and much more.
How to Install GraphicsMagick on Linux Systems
$ sudo apt update $ sudo apt install graphicsmagick
On Arch Linux and Fedora, you can install GraphicsMagick from the default system repositories using the package manager as shown.
$ sudo pacman -S graphicsmagick [On Arch Linux] $ sudo dnf install GraphicsMagick [On Fedora]
# dnf install epel-release # dnf install GraphicsMagick
How to Use GraphicsMagick on Linux
To access GraphicsMagick functions, use
gm – a powerful command-line utility, that offers several sub-commands such as display, animate, convert, montage, compare, identify, composite, and many more, for accessing the actual functions.
To confirm that the GraphicsMagick package has been installed on your system, you can run the following command.
$ gm display
Then run the following series of commands to verify many aspects of the installed package.
$ gm convert -list formats #check that the expected image formats are supported $ gm convert -list fonts #check if fonts are available $ gm convert -list delegates #check if delegates (external programs) are configured as expected $ gm convert -list colors #check if color definitions may be loaded $ gm convert -list resources #check that GraphicsMagick is properly identifying the resources of your machine
GraphicsMagick (gm) Command Usage in Linux
Following are some basic examples of how to use
gm commands with these options.
View Image in Linux Terminal
To display or view an image from the terminal, run the following command.
$ gm display girlfriend.jpeg
Resize Image In Linux Terminal
To resize an image with a new width, specify a width and height that will auto-scale proportionally as shown.
$ gm convert -resize 300 girlfriend-1.jpeg girlfriend-1-resize-300.jpeg $ gm display girlfriend-1-resize-300.png
You can also define a width and a height, and the command will resize the image to that dimension without altering the proportions.
$ gm convert -resize 300x150 girlfriend-1.jpeg girlfriend-1-resize-300x150.jpeg $ gm display girlfriend-1-resize-300.png
Create Animated Image in Linux Terminal
To create an animated image of multiple images in the current working directory, you can use the following command.
$ gm animate *.png
Note: The above-animated image quality is poor because we have optimized to lower the size of the image.
Convert Image in Linux Terminal
To convert an image from one format to another, for example
.png and vice-versa.
$ gm convert girlfriend.jpeg girlfriend.png
You can also create a visual image directory of all your
.png images as shown.
$ gm convert 'vid:*.jpeg' all_png.miff $ gm display all_png.miff
Create Composite Image in Linux Terminal
Additionally, it is possible to create a composite image (in a grid format) from separate images as shown.
$ gm montage girlfriend.jpeg girlfriend-1.jpeg girlfriend-2.jpeg composite_image.png $ gm display composite_image.png
There is a lot you can do with gm command, we have just covered a few basic examples in this article. You can see all options for gm and its sub-command, for example, convert, type:
$ gm -help $ gm help convert
For more information, visit GraphicsMagick Homepage: http://www.graphicsmagick.org/
GraphicsMagick is a powerful and feature-rich image-processing system for Linux and other Unix-like systems. If you have any questions or thoughts to share, use the feedback form below.