On Wed, Mar 17, 2010 at 02:06:37PM -0700, Larry Colen wrote: > On 3/17/2010 1:57 PM, John Francis wrote: >> On Wed, Mar 17, 2010 at 12:16:17PM -0600, steve harley wrote: >> >>> On 2010-03-17 11:07 , John Francis wrote: >>> >>>> On Wed, Mar 17, 2010 at 09:56:11AM -0700, Larry Colen wrote: >>>> >>>>> Another post processing question that's been niggling at me. Is there >>>>> any reason that a program like lightroom couldn't do binning, and turn >>>>> 14MP K20 files into 7MP files with twice the dynamic range? >>>>> >>>> Yes - the laws of physics. >>>> >>>> Two 14-bit pixels binned together give you one 15-bit pixel (with a 7% >>>> theoretical maximum improvement in dynamic range), not a 28-bit pixel. >>>> >>> dynamic range is based on the number of possible values, not on the >>> number of bits representing those values, so one additional bit >>> (regardless of the starting number) represents a theoretical doubling of >>> dynamic range, at least on a linear scale >>> > > >> Photographically speaking, dynamic range is generally quoted in f-stops. >> That's a logarithmic scale, not a linear one. >> >> > > So half the pixels, or one more bit, gives you 1, (or 1/2 if its square > root) stop more dynamic range?
Yep. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
