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
