Colors palettes

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Description

Functions for creating a vector of colors from pre-speficied palettes.

Usage

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Arguments

n

a numerical value specifying the number of colors in the palette.

Details

jet.colors() creates a palette of colors which tend to have high brightness and not uniform luminance. Furthermore, the brightest colors, yellow and cyan, are used for intermediate data values, and this has the effect of emphasizing uninteresting (and arbitrary) values while demphasizing the extremes. For these reasons this popular palette is not recommended.
spectral.colors() creates a palette based on ColorBrewer http://colorbrewer2.org, so the resulting colors have a much uniform luminance.
The bl2gr.colors() palette returns a palette of colors from blue to green.

Value

Returns a character vector of colors encoded in hexadecimal values.

See Also

colors, rgb.

Examples

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jet.colors(9)
spectral.colors(9)
bl2gr.colors(9)

par(mfrow = c(3,1), mar = c(1,1,1,1))
n = 21
image(1:21, 1, as.matrix(1:21), col = jet.colors(21),
      ylab = "", xlab = "", xaxt = "n", yaxt = "n", bty = "n")
image(1:21, 1, as.matrix(1:21), col = spectral.colors(21),
      ylab = "", xlab = "", xaxt = "n", yaxt = "n", bty = "n")
image(1:21, 1, as.matrix(1:21), col = bl2gr.colors(21),
      ylab = "", xlab = "", xaxt = "n", yaxt = "n", bty = "n")