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Author Topic: Units of Luminosity from Camera into PS  (Read 1211 times)


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Units of Luminosity from Camera into PS
« on: August 16, 2004, 12:13:32 AM »

[font color=\'#000000\']Looking for a technically sound reference source that deals with units of brightness as they move from light image on the sensor ( photons per sq mm per second? ha!) to sensor output (? electronic charge per sensor site or millivolts?) that is fed to the A-D converter producing 8 to 12 bit information.

A very basic issue is whether the digital tone scale is indeed linearly related to brightness or logarithmically related to brightness ( as in ev units). i.e if brightness is described by a 0 to 255 scale does each unit represent a constant fraction of an ev unit or a constant increment of sensor voltage/current/charge output?   Question to follow on histograms and dynamic range.[/font]
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