Transparent equivalent of given color

Question

I\'ve had this a few times, so here goes: I\'m making some plots which hold curves with estimates of a parameter given a tuning parameter.

Typically, I also have SDs

Answer 1

Converting valuable comment to answer:

Use alpha from package scales - first argument is colour, second alpha (in 0-1 range).

Or write function overt it:

makeTransparent <- function(someColor, alpha=100) scales::alpha(someColor, alpha/100)