布里爾
（重定向自Bril (unit)）
布里爾定義為在亮度一微朗伯的區域，適應黑暗的眼睛可以接受到的亮度[1][2][註 1]。
人感受到的亮度和物體表面的亮度不是成正比，像古斯塔夫·费希纳提出的韋伯-費希納定理及斯坦利·史密斯·史蒂文斯提出的斯蒂文斯冪律一様。
因為眼睛在不同的亮度會調整其對光的靈敏度，進行部份的補償。因此感受到的亮度會和眼睛光适应有關。
參考資料
- ^ J.C. Stevens, L.E. Marks: Stevens’s Power Law in Vision: Exponents, Intercepts, and Thresholds. In: Fechner Day 99: Proceedings of the Fifteenth Annual Meeting of the International Society for Psychophysics. 1999, S. 82–87 (online （页面存档备份，存于互联网档案馆）): „One bril is the brightness produced by 40 dB re 10-10 lambert [0.003 cd/m2] in a dark-adapted eye.“ (d. h. die 1 Bril verursachende Leuchtdichte liegt um einen Faktor 10000 (40 dB) über der Referenzleuchtdichte 10−10 Lambert)
- ^ G. van den Brink: Subjective Brightness during Dark-Adaptation. In: Vision Research. 2, Nr. 12, 1962, S. 495–502, doi:10.1016/0042-6989(62)90051-2: „A bril is defined as the brightness seen by a dark-adapted observer when he views a luminance of 40 decibels (dB).“
- ^ 3.0 3.1 J.C. Stevens, L.E. Marks: Stevens’s Power Law in Vision: Exponents, Intercepts, and Thresholds. In: Fechner Day 99: Proceedings of the Fifteenth Annual Meeting of the International Society for Psychophysics. 1999, S. 82–87, Fig. 1 (online).