>>>>> Ben Bolker >>>>> on Mon, 30 Nov 2020 16:33:23 -0500 writes:
> The 'offset' argument description is blank ... > maybe 'additive adjustment to each of the (red, green, blue, alpha) > values defining the colors, after adjustment by the corresponding > \code{.f} factor' ...? Thank you, Ben. I'm using adjustcolor() very often, and I had also wondered about the documentation "FIXME" there. As I've not been a real expert in color space transformations, I hadn't dared to describe it myself, but your description above is clearly better than the emptyness ... Maybe someone can add something, or contribute some example(s) on how using offset != 0 makes sense ? > This is the relevant code: > x <- col2rgb(col, alpha = TRUE)/255 > x[] <- pmax(0, pmin(1, > transform %*% x + > matrix(offset, nrow = 4L, ncol = ncol(x)))) > rgb(x[1L,], x[2L,], x[3L,], x[4L,]) ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel