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Author Topic: DR-greater than 12ev?  (Read 3342 times)

Offline LightCapture

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DR-greater than 12ev?
« on: April 01, 2012, 05:34:27 am »
This a comment for this page on the website
Sorry if this is a dumb question, but how can a sensor with 12bit ADC have more than 12ev of dynamic range in screen view? It seems like quantization noise alone should limit the dynamic range to 12ev.  I can see how print view would add a half stop of range since in this case you averaging about 2 pixels to make one, so noise is sqrt2/2 of what is was before normalization.  Anyway, if someone could explain how this 12bit sensor can have more than 12ev in screen view, it would be appreciated!

Offline dosdan

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Re: DR-greater than 12ev?
« Reply #1 on: April 01, 2012, 11:14:30 am »
GordonBGood, a photographic engineer, argues that if the ADC is properly dithered, an extra 1.8 EV DR is available i.e. a 12-bit system has a DR of about 13.8 EV

http://forums.dpreview.com/forums/read.asp?forum=1018&message=41071974

This topic is covered within this thread:

http://forums.dpreview.com/forums/read.asp?forum=1018&message=40976432

Dan.

Offline MikeWhis

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Re: DR-greater than 12ev?
« Reply #2 on: April 18, 2012, 02:54:04 pm »
You can map those 14 bits into 8 bits.