Convert colors to grey/grayscale so that you can see how your plot will look after photocopying or printing to a non-color printer.
Colors to convert.
converts colors to greyscale using the formula grey=0.3*red + 0.59*green + 0.11*blue. This allows you to see how your color plot will approximately look when printed on a non-color printer or photocopied.
A vector of colors (greys) corresponding to the input colors.
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