Luminance distribution

Japanese: 輝度分布 - きどぶんぷ（英語表記）luminance distribution

This refers to the difference in brightness (luminance) of various objects seen by humans and their spatial arrangement. The field of vision in an room is made up of areas of different brightness and darkness, ranging from very bright objects such as windows and light sources to very dark objects such as corners of a room or under a desk. Differences in luminance are an important clue for identifying an object, but on the other hand, if the difference in luminance occupying the field of vision is too large, the human eye becomes fatigued as it is forced to adapt to bright surfaces and dark surfaces and make rapid changes.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

人間が見るさまざまな対象物の明るさ(輝度)の違いおよびその空間的な配置関係をいう。室内における視野は，窓や照明光源のように非常に明るい対象から，部屋の隅や机の下のように非常に暗い対象まで，明暗の異なる部分からなる。輝度の差異は，その対象物を識別するための重要な手がかりであるが，反面，視野を占める輝度の違いが大きすぎると，人間の目は，明るい面に順応したり，暗い面に順応したり，めまぐるしい変化を強いられ疲労する。

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