col2grey: Convert colors to grey/grayscale so that you can see how your...

In jerryzhujian9/zmisc: ez Zhu's miscellaneous functions

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

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

col2grey(col)

col2gray(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.

Value

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

Note

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.

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')))

jerryzhujian9/zmisc documentation built on March 9, 2024, 12:49 a.m.