Other formats, and going between formats:

The XV program lets you convert in and out of the image formats listed above, as well as several other formats you may encounter, such as PBM, PGM, PPM, X11 bitmaps, XPM, BMP, Sun Rasterfiles, IRIS RGB, Targa, FITS, and many others. The GIMP also is useful for that purpose. However, the resolution and quality of the converted images is dependent in the such things as your monitor screen, especially if PostScript is involved. You will get better results using the command line utilities listed in /mit/graphics/bin/. One of the better utilities is imconvert. To see all the things you can do with imconvert, do add graphics; man imconvert and take a nice look at the manual page. For example, to convert an image named foo.pbm to the GIF format, the command would be imconvert foo.pbm gif:foo.gif. This utility also performs a plethora of image processing manipulations. You can also use xv only at the command line. To see how, add graphics; man xv.