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This page is incorrect. It misses completely the use of brightness as a term in astronomy used to discuss the irradiance or radiant emittance from a star and measured in W/m^2.
Brightness is correctly defined as a lowercase b and is equal to the luminosity of the star, L, divided by 4 * pi * r^2 where r is the distance from the star to the surface the brightness is being measured.
Does that (old version of a) federal telecommunications standard in reference 2 really matter that much? From a quick survey it seems that there are other accepted definitions in colorimetry and photometry of lightness and brightness.
Also see Talk:Lightness - Ridiculous youtube reference , I don't think these articles were made by competent people.
Gabrolf ( talk) 15:07, 26 January 2017 (UTC)
It seems a contradiction in the entry to say that it is both "subjective" and also "absolute," which implies perfect objectivity. The author seems to be confusing "brightness," which describes something perceived, with "luminance," which is a measure of the amount light reflected or emitted by a surface, which we can measure with instruments. — Preceding unsigned comment added by Gitchygoomy ( talk • contribs) 07:25, 17 March 2017 (UTC)
For better or worse, this articles covers several completely different topics. North8000 ( talk) 16:58, 30 March 2021 (UTC)
Nevertheless, more work to be done. This page really should be associated with colorimetry and color science as "brightness" is a perceptual quality, as is lightness/darkness.
If discussing light in physics, a more appropriate term in many cases is luminance. Luminance is light, spectrally weighted per human vision, however luminance is linear relative to light, but not linear relative to human perception. For discussing human perception, the terms lightness (L* or J) or brightness (Q) are used. Myndex ( talk) 02:09, 1 September 2021 (UTC)
What is brightness 42.109.238.23 ( talk) 02:17, 12 March 2022 (UTC)
The SI photometry quantities are impossible to follow unless you already know what lumens and lux are. Could somebody please put these units into SI units like watts/m2/steradian? Geoffrey.landis ( talk) 16:32, 13 September 2022 (UTC)
This article is rated Start-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||||||||||||||||||||
|
This page is incorrect. It misses completely the use of brightness as a term in astronomy used to discuss the irradiance or radiant emittance from a star and measured in W/m^2.
Brightness is correctly defined as a lowercase b and is equal to the luminosity of the star, L, divided by 4 * pi * r^2 where r is the distance from the star to the surface the brightness is being measured.
Does that (old version of a) federal telecommunications standard in reference 2 really matter that much? From a quick survey it seems that there are other accepted definitions in colorimetry and photometry of lightness and brightness.
Also see Talk:Lightness - Ridiculous youtube reference , I don't think these articles were made by competent people.
Gabrolf ( talk) 15:07, 26 January 2017 (UTC)
It seems a contradiction in the entry to say that it is both "subjective" and also "absolute," which implies perfect objectivity. The author seems to be confusing "brightness," which describes something perceived, with "luminance," which is a measure of the amount light reflected or emitted by a surface, which we can measure with instruments. — Preceding unsigned comment added by Gitchygoomy ( talk • contribs) 07:25, 17 March 2017 (UTC)
For better or worse, this articles covers several completely different topics. North8000 ( talk) 16:58, 30 March 2021 (UTC)
Nevertheless, more work to be done. This page really should be associated with colorimetry and color science as "brightness" is a perceptual quality, as is lightness/darkness.
If discussing light in physics, a more appropriate term in many cases is luminance. Luminance is light, spectrally weighted per human vision, however luminance is linear relative to light, but not linear relative to human perception. For discussing human perception, the terms lightness (L* or J) or brightness (Q) are used. Myndex ( talk) 02:09, 1 September 2021 (UTC)
What is brightness 42.109.238.23 ( talk) 02:17, 12 March 2022 (UTC)
The SI photometry quantities are impossible to follow unless you already know what lumens and lux are. Could somebody please put these units into SI units like watts/m2/steradian? Geoffrey.landis ( talk) 16:32, 13 September 2022 (UTC)