retrieve the luma of a Color object
a Color object created with ColorTools[Color]
The Luma command returns the luma of a Color object, which is a float between 0. and 1.0 representing the lightness of a color with 1.0 being white and 0. being black.
The calculation is performed using the formula Y '=0.3⁢R+0.59⁢G+0.11⁢B where (R,G,B) is the RGB triple for the color.
c≔〈RGB : 0 1 0〉
The ColorTools[Color][Luma] command was introduced in Maple 2017.
For more information on Maple 2017 changes, see Updates in Maple 2017.
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