xv is an X11 program that displays images in the GIF,
JPEG, TIFF, PBM, PGM, PPM, X11 bitmap, Utah Raster Toolkit
RLE, PDS/VICAR, Sun Rasterfile, BMP, XPM, PCX, IRIS RGB,
possibly PostScript, and PM formats on workstations and
terminals running the X Window System, Version 11.