pals (version 1.9)

pal.dist: Measure the pointwise distance between two palettes

Description

Measure the pointwise distance between two palettes

Usage

pal.dist(pal1, pal2, n = 255)

Value

A vector of n distances.

Arguments

pal1

A color palette (function or vector)

pal2

A color palette (function or vector)

n

Number of colors to use, default 255

Author

Kevin Wright

Details

The distance between two palettes (of equal length) is calculated pointwise using the Lab color space. A 'just noticeable difference' between colors is roughly 2.3.

References

https://en.wikipedia.org/wiki/Color_difference

Examples

pa0 <- c("#ff0000","#00ff00","#0000ff")
pa1 <- c("#fa0000","#00fa00","#0000fa") # 2.4
pa2 <- c("#f40000","#00f400","#0000f4") # 5.2
pal.dist(pa0,pa1) # 1.87, 2.36, 2.11
pal.dist(pa0,pa2) # 4.12 5.20 4.68
pal.bands(pa1,pa0,pa2, labels=c("1.87  2.36  2.11","0","4.12  5.20  4.68"))
title("Lab distances from middle palette")