

   HHSSVV CCoolloorr SSppeecciiffiiccaattiioonn

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

   AArrgguummeennttss::

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

      gamma: a ``gamma correction'', see ...

   VVaalluuee::

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

   SSeeee AAllssoo::

        `rainbow', `rgb', `gray'.

   EExxaammpplleess::

        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)

