hsv {base}R Documentation

HSV Color Specification

Description

Create a vector of colors from vectors specifying hue, saturation and value.

Usage

hsv(h=1, s=1, v=1, gamma=1)

Arguments

h,s,v numeric vectors of values in the range [0,1] for ``hue'', ``saturation'' and ``value'' to be combined to form a vector of colors. Values in shorter arguments are recycled.
gamma a ``gamma correction''

Value

This function creates a vector of ``colors'' corresponding to the given values in HSV space. The values returned by hsv can be used with a col= specification in graphics functions or in par.

See Also

rainbow, rgb, gray.

Examples

hsv(.5,.5,.5)

## Look at gamma effect:
n <- 20;  y <- -sin(3*pi*((1:n)-1/2)/n)
op <- par(mfrow=c(3,2),mar=rep(1.5,4))
for(gamma in c(.4, .6, .8, 1, 1.2, 1.5))
  plot(y,axes=F,frame.plot=T,xlab="",ylab="",pch=21,cex=30,
       bg = rainbow(n, start=.85, end=.1, gamma = gamma),
       main = paste("Red tones;  gamma=",format(gamma)))
par(op)
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