Add transparency to a color defined by its name or number. The function first converts the color to RGB and then appends the alpha channel.
vector of two kind of R colors, i.e., either a color name (an element of
the alpha value to be added. This can be any value from 0 (fully transparent) to 1 (opaque).
All arguments are recyled as necessary.
Vector with the same length as
col, giving the rgb-values extended by the alpha channel as hex-number (#rrggbbaa).
Andri Signorell <[email protected]>
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