colorblindr: Simulate colorblindness in R figures

#' Color palette proposed by Okabe and Ito
#'
#' Two color palettes taken from the article ["Color Universal Design" by Okabe and Ito](https://web.archive.org/web/20210108233739/http://jfly.iam.u-tokyo.ac.jp/color/).
#' The variant `palette_OkabeIto` contains a gray color, while `palette_OkabeIto_black` contains black instead.
#' @export
palette_OkabeIto <- c("#E69F00", "#56B4E9", "#009E73", "#F0E442", "#0072B2", "#D55E00", "#CC79A7", "#999999")

#' @rdname palette_OkabeIto
#' @export
palette_OkabeIto_black <- c("#E69F00", "#56B4E9", "#009E73", "#F0E442", "#0072B2", "#D55E00", "#CC79A7", "#000000")