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The "attribute of a visual sensation according to which an area appears to be similar to one of the perceived colors: red, yellow, green, and blue, or to a combination of two of them". [8] Lightness, value The "brightness relative to the brightness of a similarly illuminated white". [8] Luminance (Y or L v,Ω)
RGB uses additive color mixing, because it describes what kind of light needs to be emitted to produce a given color. RGB stores individual values for red, green and blue. RGBA is RGB with an additional channel, alpha, to indicate transparency. Common color spaces based on the RGB model include sRGB, Adobe RGB, ProPhoto RGB, scRGB, and CIE RGB.
RGB (red, green, blue) describes the chromaticity component of a given color, when excluding luminance. RGB itself is not a color space, it is a color model. There are many different color spaces that employ this color model to describe their chromaticities because the R/G/B chromaticities are one facet for reproducing color in CRT & LED displays.
Chromaticity is an objective specification of the quality of a color regardless of its luminance. Chromaticity consists of two independent parameters , often specified as hue ( h ) and colorfulness ( s ), where the latter is alternatively called saturation , chroma , intensity , [ 1 ] or excitation purity .
A luminance meter is a device used in photometry that can measure the luminance in a particular direction and with a particular solid angle. The simplest devices measure the luminance in a single direction while imaging luminance meters measure luminance in a way similar to the way a digital camera records color images.
where surround F is as defined above and L A is the adapting field luminance in cd/m 2. [1] log-log plot of F L vs. L A (L A ranges from 10 −4 to 10 4, F L ranges from 10 −4 to 10). The cube root approximation of F L is 0.1715L A 1/3