Sxwd is a multi-purpose tool for dealing with xwd images. Xwd is a C++ class which was created by merging xwd.c and xwud.c from the X11R6 distribution and porting them to GNU C++. Sxwd is a command line wrapper to exercise the member functions of xwd. Sxwd was created to manipulate the colormaps of 8-bit PsuedoColor XWD images in the production of custom USGS topographical maps. A few additional features have been added.