[R] Colour to RGB value?

[Duncan Murdoch]

There are a lot of ways to specify colours in R plot functions (number
from the palette, by name, etc.).  I'd like to pass a colour from an R
function to an external function, and I'd like it to have the same
flexibility.  To avoid having to interpret all possible colour
specifications myself, I need a function to convert a general colour
specification into a standard form (e.g. r,g,b values).  

Is there such a thing somewhere? 

Duncan Murdoch

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