WRONG- the bit depth determines size of the steps Or signal fidelity. Dynamic range is determined by Simple scaling the of analog signal. What you Are saying is a common misconception but its just That a misconception. Its possible to lower bit Depth while maintaing dynamic range, you just end Up with cruder gray scale rendering. jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Perry Pellechia Sent: Sunday, October 15, 2006 1:07 PM To: Pentax-Discuss Mail List Subject: Re: K10D 22 bit A/D conversion Wrong, Bit depth does determine dynamic range. The ratio of the least significant bit to the most significant bit is by definition the dynamic range of the ADC. On 10/15/06, J. C. O'Connell <[EMAIL PROTECTED]> wrote: > Maxium output voltage from the sensor has nothing > To do with bit depth of the ADC. Bit depth of the ADC > Determines number of shades not the dynamic range. > jco > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > graywolf > Sent: Sunday, October 15, 2006 10:09 AM > To: Pentax-Discuss Mail List > Subject: Re: K10D 22 bit A/D conversion > > The sensor output is an analog voltage. The ADC converts that to a > digital number. What is being said here is that they do not feel the max > > output voltage from the sensor is high enough to require a 22 bit ADC. > As I said in another post I feel that is way over simplified. > > -- > graywolf > http://www.graywolfphoto.com > http://webpages.charter.net/graywolf > "Idiot Proof" <==> "Expert Proof" > ----------------------------------- > > > J. C. O'Connell wrote: > > I don't follow you. Is the capture (sensor & ADC) done at 22 bits or > 12 > > bits? > > jco > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of > > Digital Image Studio > > Sent: Sunday, October 15, 2006 7:32 AM > > To: Pentax-Discuss Mail List > > Subject: Re: K10D 22 bit A/D conversion > > > > On 15/10/06, J. C. O'Connell <[EMAIL PROTECTED]> wrote: > >> But its been pre-processed digitally so its not true RAW > >> In my opinion. That's the only reason why the 22 bit processing > >> Makes sense to me. Do the capture and preprossing at 22 bits > >> And downconvert to 12 bit RAW for final output. > > > > Well you are free to hold that position but to me the output from the > > CCD has just been sampled and massaged to fit the 12 bit RAW profile > > optimally. We don't know the data depth in processing, we only know > > that the CCD is sampled with 22 bit data precision. The 12 bit RAW > > file is contains discrete RGB data sampled under a Bayer filter > > pattern so it has to undergo significant post processing for it to be > > even recognised as a colour image. > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- <----------------------------------------------------> Perry Pellechia Primary email: [EMAIL PROTECTED] Alternate email: [EMAIL PROTECTED] Home Page: http://homer.chem.sc.edu/perry <----------------------------------------------------> -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
