The "gifsample" executable in this distribution is a CGI that can be used
to produce color and line samples for charts.

e.g.
   http://your.host.name/cgi-bin/gifsample/40/30/255/0/0
   http://your.host.name/cgi-bin/gifsample/40/30/0/0/255?LineStyle=xx+++

Here is the way the gifsample URLs should be built:

 *  The parameters for the color sample ot return are taken from the
 *  PATH_INFO:
 *
 *  /cgi-bin/gificon/<width>/<height>/<R>/<G>/<B>
 *
 * Optional QUERY_STRING params for LINE samples:
 *
 * Passing a value for either LineStyle or LineWidth will automatically
 * generate a line sample instead of a solid color sample (the default).
 *
 * LineStyle - The sample will be a single line, using the specified
 *             pattern.  The pattern is a string in which spaces
 *             correspond to transparent pixels, and any other character
 *             will draw a pixel of the sample's color.
 *             eg. "xxxx    "
 *             Passing LineStyle="" will draw a solid line.
 * LineWidth - Width of the line sample in pixels (default is 1 pixel)