Visual Illusions, Their Causes, Characteristics And Applications

Cover Visual Illusions, Their Causes, Characteristics And Applications
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When such a filter is placed before the eyes a daytime scene outdoors, for example, is likely to appear to be illuminated to a greater intensity than LIGHTING 157 when the eyes are not looking through the filter. This is true for a glass used by the author notwithstanding the fact that the filter transmits only about one-half as much light as a perfectly clear colorless glass. In other words, the brightnesses of objects in the scene are reduced on the average about fifty per cent, still the sub...ject is impressed with an apparent increase in the intensity of illumination (and in brightness) when the filter is placed before the eyes. Of course, the actual reduction in brightness depends upon the color of the object.
In such a case as the foregoing, true explanations are likely to involve many factors. For this reason explanations are usually tedious if they are to be sufficiently qualified to be reasonably near complete- ness. In this case it appears that the yellow filter may cause one to appraise the intensity of illumina- tion as having increased, by associating such an in- fluence as the sim coming out from behind a cloud.


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