R Under development (unstable) (2024-10-04 r87206 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> suppressMessages(library(gplots))
> 
> col <- "#123456"
> col2 <- adjust_hsv(col, h=0.1)  # h
> col3 <- adjust_hsv(col, s=0.1)  # s
> col4 <- adjust_hsv(col, v=0.7)  # v
> col5 <- adjust_hsv("blue")      # name
> col6 <- adjust_hsv(4)           # integer
> col7 <- adjust_hsv(palette(), alpha=0.1)  # multiple colors, alpha
> 
> cols <- c(col2, col3, col4, col5, col6, col7)
> 
> stopifnot(all(is.character(cols)))            # character
> stopifnot(all(substring(cols, 1, 1) == "#"))  # start with #
> stopifnot(all(nchar(cols) %in% c(7, 9)))      # either 7 or 9 chars long
> 
> barplot(rep(1, length(cols)), col=cols, space=0, border=NA)  # can be used
> 
> proc.time()
   user  system elapsed 
   0.29    0.12    0.40