README.md

In dichromat: Color Schemes for Dichromats

Simulating the Effects of Color Blindness in R

Overview

The R package dichromat provides:

• Simulation of the effects of color blindness via function dichromat() for two types of red-green color blindness (type = "deutan" or "protan") and green-blue color blindness (type = "tritan").

• Data dalton from the work of Françoise Viénot and co-authors, underlying the dichromat() function. It provides a 256-color palette as it would appear with normal, protanope, deuteranope, and tritanope vision.

• A colorschemes list containing 17 color vectors suitable for people with deficient or anomalous red-green vision.

⚠️ Important note: The R package colorspace provides better functions for simulating color vision deficiency: simulate_cvd(), deutan(), protan(), tritan(). More modern robust color palettes are available in hcl.colors() and palette.colors() in base R as well as further tools in colorspace.

Installation

The stable version of dichromat is available on CRAN:

install.packages("dichromat")

The latest development version can be installed from R-universe:

install.packages("dichromat", repos = "https://zeileis.R-universe.dev")

License

The package is available under the General Public License version 2.

dichromat documentation built on July 22, 2026, 9:06 a.m.