Brightness constancy is the concept of one
perceiving objects as being a constant color even as the light reflecting off
of the object changes. In other words, we perceive an object as having a
constant lightness even while its illumination varies.
An example of this can be demonstrated
through a brick wall. When one views the bricks during an hour of the day in
which the sun directly descends on it, they appear to be the color red.
However, when one views the same bricks several hours later when there is no
longer any direct sunlight, he/she will still perceive the bricks as red even
though their true color is then grey.
The
pictures below were taken at two separate visits to the Coliseum. One picture
was captured during the day, in which the landmark was exposed directly to
sunlight, and one was taken at dusk, in which it was no longer receiving direct
sunlight. When visiting the Coliseum on the two separate occasions, I perceived
the colors to be the same. However, in accordance with the difference of
illumination, its color is varied.
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