high color vs high colours

high color

noun
  • a strong color 

  • a pinkness or redness of the face; having rosacea; having a flushed face 

  • graphics with two bytes of storage per pixel, allowing for up to 65536 different colors 

high colours

noun
  • Synonym of high colour 

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