Batch Image Resize in Ubuntu

Howto

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