Now we are looking on the crossword clue for: Absence of light.
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Possible Answers: DARKNESS.
Last seen on: –Irish Times Simplex – Dec 9 2020
Irish Times Simplex Crossword – Sep 13 2017
Random information on the term “Absence of light”:
In colorimetry and color theory, lightness, also known as value or tone, is a representation of variation in the perception of a color or color space’s brightness. It is one of the color appearance parameters of any color appearance model.
Various color models have an explicit term for this property. The Munsell color model uses the term value, while the HSL color model, HCL color space and Lab color space use the term lightness. The HSV model uses the term value a little differently: a color with a low value is nearly black, but one with a high value is the pure, fully saturated color.
In subtractive color (i.e. paints) value changes can be achieved by adding black or white to the color. However, this also reduces saturation. Chiaroscuro and Tenebrism both take advantage of dramatic contrasts of value to heighten drama in art. Artists may also employ shading, subtle manipulation of value.
The Munsell value has long been used as a perceptually uniform lightness scale. A question of interest is the relationship between the Munsell value scale and the relative luminance. Aware of the Weber–Fechner law, Munsell remarked “Should we use a logarithmic curve or curve of squares?” Neither option turned out to be quite correct; scientists eventually converged on a roughly cube-root curve, consistent with the Stevens’ power law for brightness perception, reflecting the fact that lightness is proportional to the number of nerve impulses per nerve fiber per unit time. The remainder of this section is a chronology of lightness approximations, leading to CIE LAB.