This file is indexed.

/usr/share/GraphicsMagick-1.3.18/config/colors.mgk is in libgraphicsmagick3 1.3.18-1ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0"?>
<!--
Color definition file.  Definitions in this file extend or replace the
compiled in color definitions.  Use 'gm convert -list color' to list
the currently available colors.  This file is optional and the
software will still function if it is removed.

For example:

<colormap>
  <color name="mycolor1" red="228" green="118" blue="33" compliance="None" />
  <color name="mycolor2" red="228" green="123" blue="66" compliance="X11" />
</colormap>
-->
<colormap>
</colormap>