Specify a colour by name, and alter the density without having to convert to RGB.
character. Name of colour.
numeric. Density range from 0 (transparent) to 255 (opaque).
A colour hex code, for use in plotting etc.
col can have length greater than 1, and the function will output a character of the same length.
For a list of named colours recognised by R, see: http://www.stat.columbia.edu/~tzheng/files/Rcolor.pdf.
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