* \warning In order to be of any real use <var>color</var> is not restricted to values in the filled in ColorKey. This, however, leads to possibly highly inaccurate if not meaningless results, if <var>color</var>
* \warning In order to be of any real use <var>color</var> is not restricted to values in the filled in ColorKey. This, however, leads to possibly highly inaccurate if not meaningless results, if <var>color</var>
* is too "far away" of the colors in the ColorKey. Also \code x==inv_map(fMin,fMax,map(fMin,fMax,x))\endcode will probably evaluate as <tt>false</tt>. So inv_map() is ONLY a hopefully APPROXIMATE inverse of map().
* is too "far away" of the colors in the ColorKey. Also \code x==inv_map(fMin,fMax,map(fMin,fMax,x))\endcode will probably evaluate as <tt>false</tt>. So inv_map() is ONLY a hopefully APPROXIMATE inverse of map().
*
*
* \param fMin lower interval boundary for values represented by the colormap
* \param fMin lower interval boundary for values represented by the colormap
* \param fMax upper interval boundary for values represented by the colormap
* \param fMax upper interval boundary for values represented by the colormap