PSYC 380 Lecture Notes - Lecture 7: Relative Luminance, Illuminance, Receptive Field
6 Mar 2017
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Chromaticity, luminance, reflectance, van kries adaptation, white balance. Illuminance and reflectance spectrum are multiplied to get (cid:862)colour sig(cid:374)al(cid:863) Looking at an object under different illuminations causes object to reflect back different colour signals: however, it works the other way too where different illuminations can elicit the same colour signal. Lightness is the perceptual equivalent to reflectance (not luminance) Illumination is estimated based on the average luminance within a larger area. Illumination is estimated base don the average colour signal within a larger area. Moving from one illumination to another illumination means the gain-control function is activated to adjust how many photons will be absorbed in the receptive field of a cell: r = ga, g = 1/ avg(a) Experiment- using a photometer to measure the photon catch of gray patch 1. Then adjusting the light source so that a gray patch 1 will produce the same photon catch as the patch 1.
