Luminal is another name for the hypnotic, anti-epileptic drug phenobarbital.
Luminal is the adjective used to describe things pertaining to the lumen of hollow structures.
Luminal is a common misspelling of the chemical luminol.
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The luminance signal in your TV set uses the same formula, in fact, that was its origin.
So, gray tone range in Luminance values is used by the histogram to map, or to tell us about the actual distribution of, the range of light and dark tones in our color images.
Photographs generally have more nearly all luminance values represented, where both of these samples were intentionally limited, to be able to better show the details better.
The luminance of the moon is the sum of the light from the sky and the light from the moon, and the amount of light in the sky defines three different situations.
Measuring the luminance of the moon with a handheld meter is difficult; because the moon has an angular diameter of approximately 1/2°, even a 1° spot meter won’t suffice.
At an altitude of 5°, the luminance of the moon is 561 cd/m
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