This mini-howto is taken from blog in Kayowas.
Imagemagik is an exceptional tool, I would say essential, it allows an almost endless array of processing on the images.
In systems derived from Debian, the installation is quite a:
[user@localhost ~]$ sudo apt-get install imagemagick
To vary the size of all images in a given directory, you must use the tool "mogrify"In the following way:[user@localhost ~]$ mogrify-resize "Dimensions" *.jpg
Where instead of "Dimensions"You must enter the new desired size, eg 1024*1024.
And ... that's it, nothing easier than true?