Convert colors to grey/grayscale so that you can see how your plot will look after photocopying or printing to a non-color printer.
vector of any of the three kind of R colors, i.e., either a color name (an element of colors()), a hexadecimal string of the form "#rrggbb" or "#rrggbbaa" (see rgb), or an integer i meaning palette()[i]. Non-string values are coerced to integer.
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.
These function was previously published as
Col2Grey() in the TeachingDemos package and has been integrated here without logical changes.
Greg Snow <email@example.com>
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