Photopic curve

A photoptic curve is a diagram showing that, in bright light, the strongest response of the human eye is to the colour green with less sensitivity towards the spectral extremes of red and violet.

  • For everyday light levels, the photopic luminosity function best approximates the response of the human eye.
  • The photopic curve is the CIE standard curve used in the CIE 1931 color space.
  • For low light levels, the response of the human eye changes, and the scotopic curve applies.