en>John of Reading: Typo/general fixing, replaced: used used → used using AWB

2014-12-20T17:49:33Z

Typo/general fixing, replaced: used used → used using AWB

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14.136.238.193: Undid revision 598217683 by 14.136.238.193 (talk)

2014-03-05T05:43:28Z

Undid revision 598217683 by 14.136.238.193 (talk)

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en>Monkbot: /* History */Fix CS1 deprecated date parameter errors

2014-01-24T13:50:02Z

History: Fix CS1 deprecated date parameter errors

← Older revision		Revision as of 15:50, 24 January 2014
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	~~Acer considered premier laptop manufacturing companies~~ in ~~exciting world of~~. It is a ~~Taiwan based electronic device manufacturer~~ which ~~includes really managed~~ to ~~make it big planet domain~~ of ~~computers and computer fashion accessories~~. ~~While Acer makes all types~~ of ~~electronic devices~~, it is ~~really well famous for its associated with laptops~~ and ~~hard drives~~. UK has ~~now seen numerous people that buy Acer laptops and hard drives. Looking at very best deals in this particular brand then going online makes belly sense~~.<br><br>~~The big question though, is could we have progressed any faster and further in that space in time? The answer to that question can be a big resounding YES!~~<br><br><br><br>If you ~~compare~~ a ~~pair of paragraphs and think about third world countries~~, ~~arriving~~ the ~~opportunities there second career -~~ the ~~stuff we keep making reference to~~. ~~They have low~~ to no ~~technology right now, just think where they will be in a couple years~~. ~~hmmm~~ can ~~you hear opportunity knocking for~~ the ~~door right now~~?<br><br>~~The prints are very smooth in picture printers and~~ the dots are not visible in any way even if magnified. Most inkjet printers shows the dot pattern on the print outs. They print n excellent details of shadows in dark areas too; may possibly appear blotchy in inkjet prints.<br><br>~~Be likely to always examine~~ the ~~labels of cosmetic products you buy and certainly not a harsh chemicals for alcohol, Petroleum, Prebnim~~ (~~a preservative~~), ~~artificial fragrances equally.~~<br><br>~~Explore~~ the ~~depths. Heading for a job~~ is ~~like deciding whether to marry someone else. The more~~ of ~~his~~ (~~or her~~) ~~friends you meet~~, the ~~extra likely you'll exactly what you're implementing~~. ~~Ken should have expanded his interview incorporate more people the insurance company. But Ken~~'s ~~not alone~~. ~~Few job candidates require exploring a service provider in enough depth~~ for ~~getting a good regarding who they shall be living with day in~~, ~~day out~~.<br><br>~~You will have long nights. you will have temporary defeat. and you will then definitely be laughed at by your family members near~~ the ~~beginning~~ of ~~the building.~~<br><br>~~Choosing~~ a ~~market is~~ a ~~colossal step any person. I let my niche find me~~, ~~which turns out to be~~ the ~~obvious do doing it. Learn as much as you can~~, ~~start blogging, listen~~ to ~~teleseminars and other training~~, ~~and~~ to ~~get involved with social advertising~~. ~~Soon you will realize what you want to do online, and next it will all get together for then you~~. ~~For me, realizing that people planned to learn technology from me was monstrous~~. ~~I was taking what I knew for granted,~~ and ~~it turned out I can build~~ a ~~ready-made business around something which fun so that i can do~~.~~<br><br>If you loved this short article~~ and ~~you would like to receive extra facts regarding~~ [http://www.~~ractiv~~.com/ ~~gesture control~~] ~~kindly pay a visit to our web site~~.		{{Distinguish\|Luma (video)}}
			{{Other uses}}
			'''Luminance''' is a [[Photometry (optics)\|photometric]] measure of the [[luminous intensity]] per unit area of [[light]] travelling in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given [[solid angle]]. The [[SI]] unit for luminance is [[candela per square metre]] (cd/m<sup>2</sup>). A non-SI term for the same unit is the "nit". The [[CGS]] unit of luminance is the [[stilb (luminance)\|stilb]], which is equal to one candela per square centimetre or 10 kcd/m<sup>2</sup>.

			==Explanation==
			Luminance is often used to characterize emission or reflection from flat, [[diffuse reflection\|diffuse]] surfaces. The luminance indicates how much [[luminous flux\|luminous power]] will be detected by an [[Human eye\|eye]] looking at the surface from a particular angle of view. Luminance is thus an indicator of how [[brightness\|bright]] the surface will appear. In this case, the solid angle of interest is the solid angle subtended by the eye's [[pupil]]. Luminance is used in the video industry to characterize the brightness of displays. A typical computer display emits between 50 and 300 cd/m<sup>2</sup>. The sun has luminance of about 1.6×10<sup>9</sup> cd/m<sup>2</sup> at noon.<ref>{{cite web \|url=http://www.schorsch.com/kbase/glossary/luminance.html \|title=Luminance \|work=Lighting Design Glossary \|accessdate=Apr 13, 2009}}</ref>

			Luminance is [[Invariant (physics)\|invariant]] in [[geometric optics]]. This means that for an ideal optical system, the luminance at the output is the same as the input luminance. For real, passive, optical systems, the output luminance is ''at most'' equal to the input. As an example, if you form a demagnified image with a lens, the luminous power is concentrated into a smaller area, meaning that the [[illuminance]] is higher at the image. The light at the image plane, however, fills a larger solid angle so the luminance comes out to be the same assuming there is no loss at the lens. The image can never be "brighter" than the source.

			==Definition==
			Luminance is defined <ref>{{cite book \| last = Chaves \| first = Julio \| title = [http://books.google.de/books?id=ykk1xQc25c0C&pg=PA449 "Introduction to Nonimaging Optics"] \| publisher = [[CRC Press]] \| series = Optical Science and Engineering \| volume = 134 \| year = 2008 \| page = 449 \| isbn = 9781420054293 }}</ref> by the [[derivative]]
			:<math>L_\mathrm{v} = \frac{\mathrm{d}^2 \Phi_\mathrm{v}}{\mathrm{d}A\,\mathrm{d}{\Omega} \cos \theta}</math>

			where
			:<math>L_\mathrm{v}</math> is the luminance ([[candela\|cd]]/[[square metre\|m<sup>2</sup>]]),
			:<math>\Phi_\mathrm{v}</math> is the [[luminous flux]] or luminous power ([[lumen (unit)\|lm]]),
			:<math>\theta\,</math> is the [[angle]] between the [[surface normal]] and the specified direction,
			:<math>A</math> is the [[area]] of the surface ([[square metre\|m<sup>2</sup>]]), and
			:<math>\Omega\,</math> is the [[solid angle]] ([[Steradian\|sr]]).
			The expression is written using [[Leibniz's notation]].

			==Units==
			A variety of units have been used for luminance, besides the candela per square metre.

			One candela per square metre is equal to:
			*10<sup>−4</sup> [[stilb (unit)\|stilbs]] (the [[CGS]] unit of luminance)
			*π [[apostilb]]s
			*π×10<sup>−4</sup> [[lambert (unit)\|lambert]]s
			*0.292 [[foot-lambert]]s

			==See also==
			*[[Orders of magnitude (luminance)]]
			*[[Diffuse reflection]]
			*[[Etendue]]
			*[[Exposure value#EV as a measure of luminance and illuminance\|Exposure value]]
			*[[Lambertian reflectance]]
			*[[Lightness (color)\|Lightness]], property of a color
			*[[Luma (video)\|Luma]], the representation of luminance in a video monitor
			*[[Lumen (unit)]]
			*[[Radiance]], radiometric quantity analogous to luminance
			*[[Brightness]], the subjective impression of luminance
			*[[Glare (vision)\|Glare]]
			*[[Luminance meter]]
			{{SI light units}}

			==References==
			<references/>

			== External links ==
			* A Kodak guide to [http://www.kodak.com/cluster/global/en/consumer/products/techInfo/am105/am105kic.shtml Estimating Luminance and Illuminance] using a camera's exposure meter. Also available in [http://www.kodak.com/cluster/global/en/consumer/products/techInfo/am105/am105kic.pdf PDF form] and Google Docs [http://docs.google.com/gview?a=v&q=cache:3ygRnO1mEpEJ:www.kodak.com/cluster/global/en/consumer/products/techInfo/am105/am105kic.pdf+estimating+luminance+and+illuminance+with+reflection+type&hl=en&gl=ie&sig=AFQjCNGlsuOrMAs62ZwlzQilxa6mkx0QaA online version]

			[[Category:Photometry]]
			[[Category:Physical quantities]]
			<!--Don't add television-related categories. See [[Luma (video)]].-->

en>Materialscientist: Reverted edits by 203.155.58.254 (talk) to last version by Srleffler

2012-08-28T06:20:51Z

Reverted edits by 203.155.58.254 (talk) to last version by Srleffler

New page

Acer considered premier laptop manufacturing companies in exciting world of. It is a Taiwan based electronic device manufacturer which includes really managed to make it big planet domain of computers and computer fashion accessories. While Acer makes all types of electronic devices, it is really well famous for its associated with laptops and hard drives. UK has now seen numerous people that buy Acer laptops and hard drives. Looking at very best deals in this particular brand then going online makes belly sense. The big question though, is could we have progressed any faster and further in that space in time? The answer to that question can be a big resounding YES! If you compare a pair of paragraphs and think about third world countries, arriving the opportunities there second career - the stuff we keep making reference to. They have low to no technology right now, just think where they will be in a couple years. hmmm can you hear opportunity knocking for the door right now? The prints are very smooth in picture printers and the dots are not visible in any way even if magnified. Most inkjet printers shows the dot pattern on the print outs. They print n excellent details of shadows in dark areas too; may possibly appear blotchy in inkjet prints. Be likely to always examine the labels of cosmetic products you buy and certainly not a harsh chemicals for alcohol, Petroleum, Prebnim (a preservative), artificial fragrances equally. Explore the depths. Heading for a job is like deciding whether to marry someone else. The more of his (or her) friends you meet, the extra likely you'll exactly what you're implementing. Ken should have expanded his interview incorporate more people the insurance company. But Ken's not alone. Few job candidates require exploring a service provider in enough depth for getting a good regarding who they shall be living with day in, day out. You will have long nights. you will have temporary defeat. and you will then definitely be laughed at by your family members near the beginning of the building. Choosing a market is a colossal step any person. I let my niche find me, which turns out to be the obvious do doing it. Learn as much as you can, start blogging, listen to teleseminars and other training, and to get involved with social advertising. Soon you will realize what you want to do online, and next it will all get together for then you. For me, realizing that people planned to learn technology from me was monstrous. I was taking what I knew for granted, and it turned out I can build a ready-made business around something which fun so that i can do. If you loved this short article and you would like to receive extra facts regarding [http://www.ractiv.com/ gesture control] kindly pay a visit to our web site.

Lens (optics) - Revision history

en>John of Reading: Typo/general fixing, replaced: used used → used using AWB

14.136.238.193: Undid revision 598217683 by 14.136.238.193 (talk)

en>Monkbot: /* History */Fix CS1 deprecated date parameter errors

en>Materialscientist: Reverted edits by 203.155.58.254 (talk) to last version by Srleffler