ColToGrey: Convert Colors to Grey/Grayscale

In AndriSignorell/DescTools: Tools for Descriptive Statistics

Convert Colors to Grey/Grayscale

Description

Convert colors to grey/grayscale so that you can see how your plot will look after photocopying or printing to a non-color printer.

Usage

ColToGrey(col)
ColToGray(col)

Arguments

col	vector of any of the three kind of R colors, i.e., either a color name (an element of colors()), a hexadecimal string of the form "#rrggbb" or "#rrggbbaa" (see rgb), or an integer i meaning palette()[i]. Non-string values are coerced to integer.

Details

Converts colors to greyscale using the formula grey = 0.3*red + 0.59*green + 0.11*blue. This allows you to see how your color plot will approximately look when printed on a non-color printer or photocopied.

Value

A vector of colors (greys) corresponding to the input colors.

Note

These function was previously published as Col2Grey() in the TeachingDemos package and has been integrated here without logical changes.

Author(s)

Greg Snow <[e-mail]>

See Also

grey, ColToRgb, dichromat package

Examples

par(mfcol=c(2,2))
tmp <- 1:3
names(tmp) <- c('red','green','blue')

barplot(tmp, col=c('red','green','blue'))
barplot(tmp, col=ColToGrey(c('red','green','blue')))

barplot(tmp, col=c('red','#008100','#3636ff'))
barplot(tmp, col=ColToGrey(c('red','#008100','#3636ff')))

AndriSignorell/DescTools documentation built on Dec. 1, 2024, 5:13 a.m.