hsv {grDevices}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, alpha)

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.

alpha

numeric vector of values in the range [0, 1] for alpha transparency channel (0 means transparent and 1 means opaque).

Details

Semi-transparent colors (0 < alpha < 1) are supported only on some devices: see rgb.

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

hcl for a perceptually based version of hsv(), rgb and rgb2hsv for RGB to HSV conversion; rainbow, gray.

Examples

require(graphics)

hsv(.5,.5,.5)

## Red tones:
n <- 20;  y <- -sin(3*pi*((1:n)-1/2)/n)
op <- par(mar=rep(1.5,4))
plot(y, axes = FALSE, frame.plot = TRUE,
     xlab = "", ylab = "", pch = 21, cex = 30,
     bg = rainbow(n, start=.85, end=.1),
     main = "Red tones")
par(op)
[Package grDevices version 2.15.1 Index]