The ToPlotColor command converts a Color object into a plot color data structure.  See plot/structure.

$c≔\mathrm{ColorTools}:-\mathrm{Color}\left(''gold''\right)$

$c≔⟨RGB\; :\; 0.8\; 0.498\; 0.196⟩$

$\mathrm{ToPlotColor}\left(c\right)$

$\mathrm{COLOR}\left(\mathrm{RGB}\,0.7999999999\,0.4980392156\,0.1960784314\right)$

The ColorTools[Color][ToPlotColor] command was introduced in Maple 2017.

For more information on Maple 2017 changes, see Updates in Maple 2017.