pals: pal.volcano – R documentation

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pal.volcano

Show a colormap with a surface of volcano elevation

Description

Some palettes with dark colors at one end of the palette hide the shape of the volcano in the dark colors. Viridis is bad.

Usage

pal.volcano(pal, n = 100, main = "")

Arguments

`pal`	A palette function or a vector of colors.
`n`	The number of colors to display for palette functions.
`main`	Main title

Details

What to look for:

1. Can you locate the highest point on the volcano?

2. Are the upper-right and lower-right corners the same elevation?

3. Do any Mach bands circle the peak?

Value

None.

Examples

pal.volcano(parula)
pal.volcano(brewer.rdbu) # Mach banding is bad
pal.volcano(warmcool, main="warmcool") # No Mach band 
pal.volcano(rev(viridis(100))) # Bad: peak position is hidden

pals

Color Palettes, Colormaps, and Tools to Evaluate Them

v1.7

GPL-3

Authors

Kevin Wright [aut, cre] (<https://orcid.org/0000-0002-0617-8673>)

Initial release

2021-04-16