There are various graphical tools available for manipulating images. but Imagine doing this using command line. sounds geeky !
This can be useful when you want to perform the same action on large number of images. think about reducing the size/quality of 100's of images captured on your digital camera so that you can upload them to the internet, or email them.
ImageMagick is a collection of tools that can help you do this.
You can download it from http://www.imagemagick.org/script/index.php . On ubuntu install it by typing "sudo apt-get install imagemagick"
"man imagemagick" for man page of imagemagick.
You can also look at the man page of individual tools for more detailed information
Useful Links:
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Imagemagick page:
http://www.imagemagick.org/script/index.php
found this page particularly useful.
http://www.imagemagick.org/Usage/
quick start to reduce image sizes:
http://www.linuxforums.org/forum/suse-linux-help/39848-how-reduce-jpeg-file-size-email.html
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