How do I use xv?

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.

You can use xv on any LPL UNIX machine by typing this command at the UNIX shell prompt: 
/opt/lpl/bin/xv

Click here for more information: XV Home Page