Editing Photographic quantity

{{Short description|Measure of the amount of light received by a sensor}}
{{Unreferenced|date=February 2024}}
'''Photographic quantity''' (also known as '''photoquantity''') is a measure of the amount of light received by a [[sensor]], such as a [[camera]], in dimensionless units that account for information lost by integration over the [[optical spectrum|spectral]] response of the sensor, while otherwise preserving the [[linear]] relationship involved in the interaction of light through one or more [[Exposure (photography)|exposures]]. The photoquantity is neither [[radiometric]] nor [[Photometry (optics)|photometric]]. The photoquantity is not radiometric because the sensor, camera, or the like, is not an ideal receiving antenna. Rather, the sensor has some non-flat spectral response. The photoquantity is not photometric, because the sensor's spectral response does not necessarily match the spectral response of the human eye.

Photoquantities are often involved in the solutions to [[comparametric equation]]s, appear in research papers dealing with [[image processing]], and are also used in the production of visual art made from multiple differently illuminated pictures of the same subject matter.

==External links==
* [http://wearcam.org/dusting/ Gallery of Lightvector paintings]
* [http://iul.eng.fiu.edu/candocia/Publications/Publications.htm Research papers]

[[Category:Imaging]]
[[Category:Science of photography]]