This namespace contiains utilities for interfacing with definitions from 
the book "A Dictionary of Colour Combinations" compiled by Sanzo Wada.

This namespace contains various functions for transforming
  color information across different representations, i.e. the
  way colors can be represented as tuples of numbers.

Note: by default, a "color" is a 3-vec, 4-vec, or 5-vec of numbers
  (with the last entry typically being the Alpha channel) whereas
  the term "Color" refers to the java.awt.Color class.

This namespace contains an implementation of procedural 
  periodic color palettes. It is based on a Inigo Quilez
  article from 1999.

A color palette is simply a unary function that accepts an
  input value and returns an RGB vec. As the input runs 
  from 0 to 1 (normalized palette index), the palette
  oscilates.

See https://iquilezles.org/articles/palettes/