Convert RGB color to text hexadecimal representation.

Convert an RGB color to '#RRGGBB' representation. Useful e.g. to use a mixed color (as mixed by the mixcolor function) as a color in calls to raw graphics function. See examples.

see https://gist.github.com/mbannert/e9fcfa86de3b06068c83

rgb2hex(r, g = NULL, b = NULL)

Arguments

r	red color component, or a column 3-element vector of R,G,B values, or an object of class 'RGB'
g	optional green color component
b	optional blue color component

Examples

require(colorspace)
#> Loading required package: colorspace
#> Loading required package: methods

col1<-RGB(t(col2rgb('yellow')))
col2<-RGB(t(col2rgb('black')))
mixCol<-mixcolor(.3,col1,col2)
col<-rgb2hex(mixCol)
plot(c(0,1,2),c(0,0,0),xlim=c(-.5,2.5),ty='p',pch=21,cex=15,col='black',
  bg=c('yellow',col,'black'),frame=FALSE,xlab='',ylab='',xaxt='n',yaxt='n')