An implementation of Paul Tol's colour schemes for use with 'graphics' or 'ggplot2'. These schemes are ready for each type of data (qualitative, diverging or sequential), with colours that are distinct for all people, including colour-blind readers. This package provides tools to simulate colour-blindness and to test how well the colours of any palette are identifiable. Several scientific thematic schemes (geologic timescale, land cover, FAO soils, etc.) are also implemented.
khroma is a utility package: it provides usefull colour schemes for archaeological data visualization.
khroma provides Paul Tol's colour schemes and several thematic palettes (geologic timescale, FAO Soil Reference Groups, etc.) with scales for
Install the released version of
khroma from CRAN:
Or install the development version from GitHub with:
Paul Tol offers carefully chosen schemes, ready for each type of data, with colours that are:
All the scales presented in his 2018 technical note  are implemented here, for use with
The following scientific colour schemes are available:
More will be added in future releases (suggestions are welcome).
 Tol, Paul (2018). Colour Schemes. SRON. Technical Note No. SRON/EPS/TN/09-002. URL: https://personal.sron.nl/~pault/data/colourschemes.pdf.