| rgb {grDevices} | R Documentation |
RGB Color Specification
Description
This function creates “colors” corresponding to the given
intensities (between 0 and max) of the red, green and blue
primaries.
An alpha transparency value can also be specified
(0 means fully transparent and max means opaque).
If alpha is not specified, an opaque colour is generated.
The names argument may be used to provide names for the colors.
The values returned by these functions can be used with a
col= specification in graphics functions or in par.
Usage
rgb(red, green, blue, alpha, names = NULL, maxColorValue = 1)
Arguments
red, blue, green, alpha |
vectors of same length
with values in |
names |
character. The names for the resulting vector. |
maxColorValue |
number giving the maximum of the color values range, see above. |
See Also
col2rgb the “inverse” for translating R colors
to RGB vectors;
rainbow, hsv, gray.
Examples
rgb(0,1,0)
(u01 <- seq(0,1, length=11))
stopifnot(rgb(u01,u01,u01) == gray(u01))
reds <- rgb((0:15)/15, g=0,b=0, names=paste("red",0:15,sep="."))
reds
rgb(0, 0:12, 0, max = 255)# integer input