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Expose to the right

bwanaaa

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"RE: Expose to the right"

bwanaaa Registered since 11th Jul 2006
Sat 31-Mar-12 10:00 PM


>As to why, there's a reason behind the prevailing wisdom.
>There are in fact a couple reasons.
>
>Light is a geometric scale, mapped by our cameras into a
>linear scale. 1 stop of light is a doubling of the amount of
>light. Converted to a numeric value by analog to digital
>conversion, that means the difference between 16 and 32 is one
>stop, 32 to 64 is one more stop, and 64 to 128 is one more
>stop, etc. In a 12-bit conversion, the numeric value can range
>from 0-(2^12-1) or 0-4095. The brightest stop of light that
>can be recorded therefore contains a numeric range of
>2048-4095. That's a full half of the numeric scale! The next
>stop has a range of 1024-2047. Your brightest 2 stops contain
>3/4 of your numeric range! Now consider the numeric range of
>all 12 stops:
>......
>
>So, on a 12-bit capture, your brightest stop has the ability
>to contain 2048 gradations, and your darkest stop only 1. This
>is why you expose to the right, because let's say your data
>spans 8 stops.

nice explanation but it has been demonstrated that the real reason to ETTR is what you said below

>Another aspect to ETTR is signal-to-noise ratio. If your
>sensor produces a fixed amount of noise, you get improved SNR
>by giving the sensor more data (light) to the fixed noise,

here is the reason that noise eliminates our perception of banding and quantization in the darker tones

http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/noise-p3.html#bitdepth

so ettr is still valid to avoid noise-even though sensors are better they are not noise free-especially with long exposures or high iso.

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A general, generic topic Expose to the right [View all] , nwcs Awarded for his in-depth knowledge in various areas, including Landscape and Wildlife Photography , Thu 29-Mar-12 12:12 PM
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