Trade-off between achromatic colour and perceived illumination as revealed by the use of pseudoscopic inversion of apparent depthстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The albedo hypothesis was tested under apparent transformations of perceived illumination and achromatic colour induced by pseudoscopic inversion of apparent depth.
Looking through a pseudoscope made a cone attached to a vertical white screen look like a conical hole in the screen. This in turn caused the shadow which the now "invisible" cone cast on the screen to change its appearance and to look like a darkly pigmented area. The darkness of the shadow before the pseudoscopic reversal and grayness of colour after were measured by means of psychophysical scales for darkness and grayness set by the bisection method. Contrast of the shaded area was varied from 0.17 to 0.96 in 7 steps, the mean illumination of the screen having been maintained at 40 lx.
Although the albedo hypothesis in its classical form was not confirmed it was found that darkness of shadow varied linearly in inverse proportion to grayness of colour within the entire contrast range. This is in agreement with the hypothesis that achromatic colour and perceived illumination are inversely proportional to each other while the retinal illumination is constant.