This region is variable based on the amount of background luminance.
2.
The constant " K " is a function of the background luminance " B " to which the eye is assumed to be adapted.
3.
HLG is supported in Rec . 2100 with a nominal peak luminance of 1, 000 cd / m 2 and a system gamma value that can be adjusted depending on background luminance.
4.
Weber contrast is commonly used in cases where small features are present on a large uniform background, i . e ., where the average luminance is approximately equal to the background luminance.
5.
Chubb et al . assert that the principle of lateral inhibition rests on the assumption that the determining factor of perceived lightness is the ratio, at the rectangle edge, of rectangle luminance to background luminance.
6.
The blinding effect is caused in large part by reduced contrast due to light scattering in the eye by excessive brightness, or to reflection of light from dark areas in the field of vision, with luminance similar to the background luminance.
7.
They found that disruptive coloration provided the best protection from bird predators when the pattern was matched to background luminance, but even when elements in a pattern did not match, disruptive patterns were still better at reducing predation than either non-disruptive patterns or plain ( unpatterned ) control targets.
8.
In addition to these new methods, four main factors influence the degree of discomfort glare; the luminance of the glare source, the solid angle of the glare source, the background luminance, and the position of the glare source in the field of view must all be taken into account.
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