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Subject: Re: Exposure to the right and tone placement





In the example shown in your earlier post, 12 f/stops are mapped into
12 of 14 available bits. Naturally, by this definition each bit is one
f/stop. Following this logic an 8-bit image can only hold 6 f/stops of
light. This is a hard concept for my feeble mind. It doesn’t look that
different to me. If I repeat it often enough it should become a fact.
One bit equals one f/stop. One bit equals one f/stop. One bit equals one
f/stop. I got it.




On Norman Koren's web page he has a table showing how 11 Zones (f/stops) can be mapped in 10, 12, and 14 bit linear space and into 8 and 16 bit linear and gamma corrected space. It turns out that a 12 bit A-to-D converter has a potential dynamic (exposure) range of 9 zones and a 14-bit A-to-D has a potential range of 11 zones, assuming that the darkest useable zone has 8 levels.



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