Convert colors to semitransparent colors.
alphablend(col, alpha = NULL, bg = NULL)
Arguments
- col
a vector specifying colors.
- alpha
a numeric vector containing the alpha values (between 0 and 1).
- bg
the background color to be used for alphablending. This can be
used as a workaround for graphics devices that do not support
semitransparent colors.
Value
a vector containing the semitransparent colors.
Examples
alphablend("red", 0.6)
#> [1] "#FF000099"