morgenstemning (version 1.0)

ametrine: Create a colorblind-safe vector of n quasi-isoluminent colors.

Description

Create a colorblind-safe vector of n quasi-isoluminent colors.

Usage

ametrine(n = 256, mincolor = NULL, maxcolor = NULL, invert = FALSE, alpha = 1)

Arguments

n

the number of colors to be in the palette.

mincolor

a color with which to replace the lower end of the scale.

maxcolor

a color with which to replace the upper end of the scale.

invert

logical indicating whether the palette should be inverted.

alpha

the alpha transparency for the palette.

Value

A character vector of color names. This can be used either to create a user-defined color palette for subsequent graphics by palette(cv), a col = specification in graphics functions or in par.

Details

The colormap is almost isoluminent and perceived by those with a red-green color perception deficiency as a roughly linear ramp between blue and yellow. However, the colormap has been enriched with a red control point for those with normal color vision. In order to improve contrast, this colormap is slightly unbalanced in luminence, unlike isolum.

See Also

palettes and colors.

Examples

require(graphics)
# A color wheel
pie(rep(1,12), col=ametrine(12))