A power law for perceived contrast in human vision.
D005260:Female; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008027:Light; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010783:Photometry; D012684:Sensory Thresholds / Q000502:physiology; D014792:Visual Acuity