Converts an R color to RGB (red/green/blue) including a transparency (alpha channel). Similar to
col2rgb except that a transparency (alpha channel) can be included.
A vector of any of the three kinds of R color specifications (i.e., either a color name (as listed by
A numeric vector that indicates the transparency level for the color. The transparency values must be greater than 0. Transparency values greater than 1 are interpreted as the number of points plotted on top of each other before the transparency is lost and is, thus, transformed to the inverse of the transparency value provided.
A vector of hexadecimal strings of the form "#rrggbbaa" as would be returned by
Derek H. Ogle, email@example.com
col2rgb for similar functionality.
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