gray.colors
Groups of Colors
Description
Generates groups of related colors.
Usage
gray.colors(n, start = 0.3, end = 0.9, gamma = 2.2, alpha = NULL)
grey.colors(n, start = 0.3, end = 0.9, gamma = 2.2, alpha = NULL)
heat.colors(n, alpha = 1)
terrain.colors(n, alpha = 1)
topo.colors(n, alpha = 1)
cm.colors(n, alpha = 1)
Arguments
| n |
a positive integer. The number of colors desired.
|
| start |
for gray.colors and grey.colors only. A number between 0 and 1 giving the
darkness of the first output color.
|
| end |
for gray.colors and grey.colors only. A number between 0 and 1 giving the
darkness of the last output color.
|
| gamma |
for gray.colors and grey.colors only. A positive number giving the 'gamma correction'.
The sequence of of gray values will be
seq(start^gamma, end^gamma, length.out = n)^(1/gamma).
|
| alpha |
a number or a vector of numbers of length n between 0 and 1 giving
the opacity of the colors. If NULL, it does not include the opacity
in the color string.
|
Value
| gray.colors | returns a gradient of n gray colors. |
| grey.colors | returns a gradient of n grey colors. |
| heat.colors | returns n colors on a gradient from red through yellow to white. |
| terrain.colors | returns n colors on gradient from green to pink. |
| topo.colors | returns n colors with a the first third blues, the second third greens,
and the last third a gradient from yellow to pink. |
| cm.colors | returns n pastels. |
The color strings have the format "#RRGGBB" or "#RRGGBBAA" where
XX are
two digit hexadecimal values (range 00-FF) for the red, green, blue, and possible
alpha (opacity) components of the colors.
Note
gray.colors and grey.colors are identical functions.
See Also
Examples
gray.colors(5)
gray.colors(5, start=0.5, end=1)
topo.colors(5, alpha=NULL)
col2rgb(terrain.colors(12, alpha=NULL))
heat.colors(12)
cm.colors(12, alpha=NULL)