palier

/ˈpeɪliər/
noun
  1. A person who pales or becomes pale; something that makes something else seem less important or less intense by comparison.
    • The old photograph acted as a palier, making the modern colors seem even more vivid.
    • The bright neon sign was a palier next to the glowing sunset.
    • He was a palier in the group, always fading into the background.