gray.colors {grDevices}  R Documentation 
Create a vector of n
gammacorrected gray colors.
gray.colors(n, start = 0.3, end = 0.9, gamma = 2.2, alpha, rev = FALSE)
grey.colors(n, start = 0.3, end = 0.9, gamma = 2.2, alpha, rev = FALSE)
n 
the number of gray colors ( 
start 
starting gray level in the palette (should be between

end 
ending gray level in the palette. 
gamma 
the gamma correction. 
alpha 
the opacity, if specified. 
rev 
logical indicating whether the ordering of the colors should be reversed. 
The function gray.colors
chooses a series of n
gammacorrected gray levels between start
and end
:
seq(start^gamma, end^gamma, length = n)^(1/gamma)
.
The returned palette contains the corresponding gray colors.
This palette is used in barplot.default
.
grey.colors
is an alias for gray.colors
.
A vector of n
gray colors.
require(graphics)
pie(rep(1, 12), col = gray.colors(12))
barplot(1:12, col = gray.colors(12))