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[[File:LightningVolt Deep Blue Sea.jpg|thumb|Decreasing brightness with depth (underwater photo as example)]]
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'''Brightness''' is an attribute of [[visual perception]] in which a source appears to be radiating or reflecting [[light]].<ref>[http://www.merriam-webster.com/dictionary/bright Merriam-Webster.com] Merriam-Webster Dictionary definition of bright</ref> 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  ''[[:wikt:bright|bright]]'' derives from an Old English ''[[beorht]]'' with the same meaning via metathesis giving Middle English ''briht''. The word is from a [[Common Germanic]] *''{{lang|gem|berhtaz}}'', ultimately from a [[Proto-Indo-European language|PIE]] root with a closely related meaning, *''{{PIE|bhereg-}}'' "white, bright".
"Brightness" was formerly used as a synonym for the [[photometry (optics)|photometric]] term ''[[luminance]]'' and (incorrectly) for the [[radiometric]] term ''[[radiance]]''.
As defined by the US ''Federal Glossary of Telecommunication Terms'' ([[Federal Standard 1037C|FS-1037C]]), "brightness" should now be used only for non-quantitative references to physiological sensations and perceptions of light.<ref>“[http://www.its.bldrdoc.gov/fs-1037/dir-005/_0719.htm Brightness]” in Federal Standard 1037C, the ''Federal Glossary of Telecommunication Terms'' (1996)</ref>
 
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):<ref>[http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html#RTFToC36 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)."</ref>
:<math>\mu = {R + G + B \over 3 }</math>
 
Brightness is also a color coordinate in the HSB or [[HSV color space]] (hue, [[Saturation (color theory)|saturation]], and brightness or value).
 
With regard to [[star]]s, brightness is quantified as [[apparent magnitude]] and [[absolute magnitude]].
 
==Brightness of sounds==
The term "brightness" is also used in discussions of sound [[timbre]]s, in a rough analogy with visual brightness. Timbre researchers consider brightness to be one of the perceptually strongest distinctions between sounds,<ref>D. Wessel, [http://articles.ircam.fr/textes/Wessel78a/ Timbre space as a musical control structure], Computer Music Journal, 3 (1979), pp. 45–52.</ref> 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]].
 
==See also==
 
* [[Luma (video)]]
* [[Luminance (relative)]]
* [[Luminosity]]
 
==Notes==
 
{{reflist}}
 
==External links==
{{wiktionary|brightness}}
 
* [http://www.poynton.com/ColorFAQ.html Poynton's Color FAQ]
 
[[Category:Vision]]
[[Category:Photometry]]
 
[[hu:Világosság]]

Revision as of 18:29, 13 February 2014

This equipment helps to prevent water leaking from rainfall down the side of your home from building up in your basement. It is a major purchase for many people and along with a nice sized price tag comes a monthly payment, insurance, and eventually car repairs. In the event you loved this post and you want to receive more info regarding Houston roofing company please visit our own site. Sediment, debris and nutrients are being swept off the land and into our creeks, streams, rivers and lakes at an alarming pace. The odors from a fireplace will simply penetrate the structure of the house and only a professional hearth and water Restoration contractor can be in a position to use deodorizers and ozone to utterly remove the odor of fire and smoke from a property. Water usually ends in a few degree of damage whenever this fulfills along with the carpets inside your home.

Powerful industrial cleaning will take care of any mold on carpets, furniture, air ducts, walls, ceilings, or any other area. Throw properly rubbish of the kitchen in the dustbin. There are some restoration professionals that come with special services also like removal bugs from the bed and many more. Double Check - The National Roofing Contractors Association (NRCA) recommends a biannual roof inspection―during spring and fall―to contain and quickly repair roof damage. Water conservation is likely to take more of a forefront in the years ahead.

A bronze substrate, for example, may need acrylic-based coatings that do not create a galvanic reaction with the bronze substrate. Once you stop the water from coming in, if the blister isn't too unsightly you can just leave it alone. If they can't, it's important to remember that towns come and go, but extinct species are forever. We have to be prepared when misfortunes like this occurs. A UPS is a battery powered device that provides power for a short period.

Floods are only covered by flood insurance thats issued by the National Flood Insurance Program and cant be bought through nearly any insurance company. If you enjoyed this article by Heidi Rucki, please click the link above to subscribe and get others. We can expertly assist you with every step from bathroom design to completion. It is very important to know what happens in these small and delicate electronic pieces to mitigate the damage, if not completely avoid it. The financial institution would then send the endorsed check to the contractor who would deposit it in their account.

This is why it is important that the hospital's facilities management is notified immediately of any water intrusion in the building so timely response is provided. If you run production jobs twenty-four hours a day, or if you have to stay in the office until the backups are complete, full backups every night might not be the best option. If you need to use a flat iron or curling iron, apply products that are designed to protect your hair against the heat from these devices. Odds are you'll hit water at that point, and the plywood paneling will crumble and fall apart as soon as you split the vinyl coating. You need to do at least two coating but make sure that you will not exceed four coatings.