# Brightness Research Materials

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Brightness Images

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Red vs. Blue S8 Tex fights Reds and Blues in awesome action sequence
Go to RoosterTeeth.com for all of season 8 of RvB!
Justin Timberlake - Mirrors (Boyce Avenue feat. Fifth Harmony cover) on iTunes & Spotify
Win Free Tickets + VIP Meet & Greets: http://smarturl.it/BATour iTunes: http://smarturl.it/BAiTunes Spotify: http://smarturl.it/BoyceCCV2bSpotify - - - - - -...
Steve Jobs vs Bill Gates. Epic Rap Battles of History Season 2.
Download This Song: http://bit.ly/KzLBGB Click to Tweet this Vid-ee-oh! http://bit.ly/Nt9lg8 Hi. My name is Nice Peter, and this is EpicLLOYD, and this is th...
MACKLEMORE & RYAN LEWIS - CAN'T HOLD US FEAT. RAY DALTON (OFFICIAL MUSIC VIDEO)
Macklemore & Ryan Lewis present the official music video for Can't Hold Us feat. Ray Dalton. Can't Hold Us on iTunes: https://itunes.apple.com/us/album/cant-...
Draw My Life- Jenna Marbles
This video accidentally turned out kind of sad, ME SO SOWWY IT NOT POSED TO BE SAD WHO WANTS HUGS AND COOKIES? Also, FYI for anyone attempting this, it takes...
Rihanna - Only Girl (In The World)
Music video by Rihanna performing Only Girl (In The World). (C) 2010 The Island Def Jam Music Group #VEVOCertified on February 16, 2011. http://www.vevo.com/...
Jack Sparrow (feat. Michael Bolton)
Buy at iTunes: http://goo.gl/zv4o9. New album on sale now! http://turtleneckandchain.com.
Draw My Life - Ryan Higa
So i was pretty hesitant to make this video... but after all of your request, here is my Draw My Life video! Check out my 2nd Channel for more vlogs: http://...
Key & Peele: Substitute Teacher
A substitute teacher from the inner city refuses to be messed with while taking attendance.
Master Chief vs Leonidas. Epic Rap Battles of History Season 2.
download this song: http://bit.ly/ERB17 click to tweet this vid-ee-oh! http://clicktotweet.com/vCJ_8 This. Is. Merchandise: http://bit.ly/ERBMerch Hi. My nam...
Decreasing brightness with depth (underwater photo as example)

Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light.[1] In other words, brightness is the perception elicited by the luminance of a visual target. This is a subjective attribute/property of an object being observed.

## Terminology

The adjective bright derives from an Old English beorht with the same meaning via metathesis giving Middle English briht. The word is from a Common Germanic *berhtaz, ultimately from a PIE root with a closely related meaning, *bhereg- "white, bright". "Brightness" was formerly used as a synonym for the photometric term luminance and (incorrectly) for the radiometric term radiance. As defined by the US Federal Glossary of Telecommunication Terms (FS-1037C), "brightness" should now be used only for non-quantitative references to physiological sensations and perceptions of light.[2]

A given target luminance can elicit different perceptions of brightness in different contexts; see, for example, White's illusion.

In the RGB color space, brightness can be thought of as the arithmetic mean μ of the red, green, and blue color coordinates (although some of the three components make the light seem brighter than others, which, again, may be compensated by some display systems automatically):[3]

$\mu = {R + G + B \over 3 }$

Brightness is also a color coordinate in the HSB or HSV color space (hue, saturation, and brightness or value).

With regard to stars, brightness is quantified as apparent magnitude and absolute magnitude.

## Brightness of sounds

The term "brightness" is also used in discussions of sound timbres, in a rough analogy with visual brightness. Timbre researchers consider brightness to be one of the perceptually strongest distinctions between sounds,[4] and formalize it acoustically as an indication of the amount of high-frequency content in a sound, using a measure such as the spectral centroid.

## Notes

1. ^ Merriam-Webster.com Merriam-Webster Dictionary definition of bright
2. ^ Brightness” in Federal Standard 1037C, the Federal Glossary of Telecommunication Terms (1996)
3. ^ What are HSB and HLS?, Charles Poynton: "The usual formulation of HSB and HLS compute so-called "lightness" or "brightness" as (R+G+B)/3. This computation conflicts badly with the properties of colour vision, as it computes yellow to be about six times more intense than blue with the same "lightness" value (say L=50)."
4. ^ D. Wessel, Timbre space as a musical control structure, Computer Music Journal, 3 (1979), pp. 45–52.
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