Batch Resize

Why

As of 2018, the OSE wiki has a strict upper file size limit of 1M as our OSE Server infrastructure is operating on a very limited budget. For more information on why this is necessary, see Mediawiki#$maxUploadSize

These commands can trivialize the process of doing a bulk resize of images before uploading to the wiki.

Imagemagick

All it takes is one line to resize a directory full of images to your desired size if you have the ImageMagick tools package installed. convert is a tool that comes with that package.

To install ImageMagick, go to Terminal and type: (on Debian/Ubuntu based systems)

sudo apt-get install imagemagick

To resize only, go to the directory of interest:

find . -iname '*.jpg' -exec convert {} -resize 1024x768 {} \;

find . -iname '*.jpg' -exec convert {} -resize 960x720 {} \;

To resize and convert to another format (example converts JPEG to PNG):

find . -iname '*.jpg' -exec convert {} -resize 640x480 {}.png \;

mogrify

Go into Terminal and change directory to folder with your pictures with whatever percentage reduction yuou need - here it is 25%:

mogrify -resize 25% *

To switch to another format - jpg may be replaced with other formats.

mogrify -resize 50% -format jpg *

Links

• http://bdhacker.wordpress.com/2011/01/04/resize-multiple-images-in-a-folder-batch-image-resize-in-ubuntu/
• http://www.imagemagick.org/Usage/basics/#mogrify