hue vs pigmentation

hue

noun
  • A color, or shade of color; tint; dye. 

  • A character; aspect. 

  • The characteristic related to the light frequency that appears in the color, for instance red, yellow, green, cyan, blue or magenta. 

pigmentation

noun
  • Coloration of human, plant or animal tissue, especially by pigment. 

How often have the words hue and pigmentation occurred in a corpus of books? (source: Google Ngram Viewer )