col2grey: Convert colors to grey/grayscale In TeachingDemos: Demonstrations for Teaching and Learning

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

 ```1 2``` ```col2grey(cols) col2gray(cols) ```

Arguments

 `cols` Colors to convert.

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.

Author(s)

Greg Snow [email protected]

`grey`, `col2rgb`, dichromat package
 ```1 2 3 4 5 6 7 8 9``` ```par(mfcol=c(2,2)) tmp <- 1:3 names(tmp) <- c('red','green','blue') barplot( tmp, col=c('red','green','blue') ) barplot( tmp, col=col2gray( c('red','green','blue') ) ) barplot( tmp, col=c('red','#008100','#3636ff') ) barplot( tmp, col=col2grey( c('red','#008100','#3636ff') ) ) ```