xv is an interactive image manipulation program for the X Window
System. It can operate on images in the GIF, JPEG, TIFF, PBM, PGM,
PPM, XPM, X11 bitmap, Sun Rasterfile, Targa, RLE, RGB, BMP, PCX, FITS,
and PM formats on all known types of X displays. It can generate
PostScript files, and if you have ghostscript (version 2.6 or above)
installed on your machine, it can also display them.