hsv {base} | R Documentation |
Create a vector of colors from vectors specifying hue, saturation and value.
hsv(h=1, s=1, v=1, gamma=1)
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'' |
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
.
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)