ImageMagick -- An X application for displaying and manipulating images.
http://www.imagemagick.org/
ImageMagick(TM) is an image display and manipulation tool for the X Window
System. ImageMagick can read and write JPEG, TIFF, PNM, GIF, and Photo
CD image formats. It can resize, rotate, sharpen, color reduce, or add
special effects to an image, and when finished you can either save the
completed work in the original format or a different one. ImageMagick
also includes command line programs for creating animated or transparent
.gifs, creating composite images, creating thumbnail images, and more.
ImageMagick is one of your choices if you need a program to manipulate and
dis play images. If you want to develop your own applications which use
ImageMagick code or APIs, you need to install ImageMagick-devel as well.