Xv can display GIF, JPEG, TIFF, PBM, PPM, X11 bitmap, Utah Raster Toolkit RLE, PDS/VICAR, Sun Rasterfile, BMP, PCX, IRIS RGB, XPM, Targa, XWD, PostScript(TM) and PM format image files.  Xv is also capable of image manipulation like cropping, expanding, taking screenshots, etc.