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
