gray.colors            package:grDevices            R Documentation

Gray Color Palette

Description:

     Create a vector of 'n' gamma-corrected gray colors.

Usage:

     gray.colors(n, start = 0.3, end = 0.9, gamma = 2.2)
     grey.colors(n, start = 0.3, end = 0.9, gamma = 2.2)

Arguments:

       n: the number of gray colors (>= 1) to be in the palette.

   start: starting gray level in the palette (should be between '0' and
          '1' where zero indicates '"black"' and one indicates
          '"white"').

     end: ending gray level in the palette.

   gamma: the gamma correction.

Details:

     The function 'gray.colors' chooses a series of 'n' gamma-corrected
     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'.

Value:

     A vector of 'n' gray colors.

See Also:

     'gray', 'rainbow', 'palette'.

Examples:

     require(graphics)

     pie(rep(1,12), col = gray.colors(12))
     barplot(1:12, col = gray.colors(12))

