Alpern M, Zhang H Z, Noji J
University of Michigan, Ann Arbor 48109.
Vision Res. 1990;30(11):1539-53. doi: 10.1016/0042-6989(90)90142-8.
According to the pigment theory of matching, metameric matches result from the equation of the rates of photoisomerizations for each of the three classes of cone pigments excited by the two matched fields. If true, matches are radiance-invariant and additive. Tests of the theory in this paper show small but ubiquitous failures in radiance-invariance due to systematic rather than random errors in matching. A choice between two possible explanations for these systematic errors favors the view that in subjects who deliberately or intuitively search for the middle of the matching range, the errors are due to an asymmetry in the Weber fraction for color (Trezona) at low (but not high) levels of retinal illuminance.
根据匹配的色素理论，同色异谱匹配是由两个匹配视场激发的三类视锥色素中每一类的光异构化速率相等导致的。如果该理论正确，那么匹配是辐射不变且可加的。本文对该理论的测试表明，由于匹配中存在系统误差而非随机误差，辐射不变性存在虽小但普遍的偏差。对于这些系统误差的两种可能解释中，有一种观点更受青睐，即在有意或直观地寻找匹配范围中间值的受试者中，误差是由于在低（而非高）视网膜照度水平下颜色的韦伯分数（Trezona）不对称所致。
