Resize Images From Terminal Using ImageMagick

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ImageMagick - is a free software suite for the creation, modification and display of bitmap images.

There are other applications like GIMP that can be used to convert and resize images, but I like to do it the terminal way, which you might also give a try.

ImageMagick has a lot of additional utilities. Am going to talk about one of them, that is the convert.

If ImageMagick is not installed on your system you can install by running the commands below (Ubuntu)

$ sudo apt-get install imagemagick

install_imagemagick

After installation, we can now resize our images.

To resize an image

The syntax to follow:

$ convert old_image -resize % new_image

Example:

$ convert unixmen.jpg -resize 60% unixmen_new.jpg

imagemagick_resize

Understanding the above command.

If we execute the above command, the image unixmen.jpg will be resized by 60% and saved under a new name unixmen_new.jpg. (Without modifying the original file unixmen.jpg)

Converting image formats

If you want to convert images from one format to another, ImageMagick can help you do that very easily by the help of a single command.

Syntax:

$ convert image_name.jpg image_name.png

Example:

$ convert unixmen.jpg unixmen.png

convert_imagemagick

Running the above command quickly converts the image unixmen.jpg to a new format unixmen.png keeping the the first one intact without any modification.

For questions please refer to our Q/A forum at : http://ask.unixmen.com/


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