Show one palette/colormap in three dimensional RGB or LUV space

Source: R/tools.R

The palette is converted to RGB or LUV coordinates and plotted in a three-dimensional scatterplot. The LUV space is probably better, but it is easier to tweak colors by hand in RGB space.

pal.cube(pal, n = 100, label = FALSE, type = "RGB")

Arguments

pal

A palette/colormap function or a vector of colors.
n

The number of colors to display for palette functions.
label

If TRUE, show color name/value on plot
type

Either "RGB" (default) or "LUV".

Value

None

Details

What to look for:

A good palette has colors that are spread somewhat uniformly in 3D.

References

None

Examples

if (FALSE) {
pal.cube(cubehelix)
pal.cube(glasbey, n=32) # RGB, blues are too close to each other
pal.cube(glasbey, n=32, type="LUV")
pal.cube(cols25(25), type="LUV", label=TRUE)
# To open a second cube
rgl.open() # Open a new RGL device
rgl.bg(color = "white") # Setup the background color
pal.cube(colors()[c(1:152, 254:260, 362:657)]) # All R non-grey colors
}