No, you're flat out wrong here. Dynamic range is determined by the smallest quantity measurable as compared to the largest. Ignoring noise, this is determined by the variance in the signal and the bit depth. Adding noise to the equation lowers the mount of Dynamic range (as you are going from minimum measurable to minimum discernable from noise).
All other things being equal, you will get more dynamic range from a 16 bit ADC than from a 12bit ADC, because your minimum measurable signal is much smaller (1/65536th of max measurable signal rather than 1/4096th). -Adam J. C. O'Connell wrote: > No, it isnt. > > Dynamic range is INDEPENDENT > Of bit depth. Bit depth only > Determines the NUMBER of shades, > Not the absolute range of shades > Because that is controlled via analog scaling > In the design before & after A/D & D/A stages. > Bit depth is simply the number of shades available > In the system, that's all. > jco > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > Perry Pellechia > Sent: Sunday, October 15, 2006 2:31 PM > To: Pentax-Discuss Mail List > Subject: Re: K10D 22 bit A/D conversion > > Everyone is wrong but you! > > Yes higher number of bit will yield better fideleity. That's not the > issue. Dyanamic range is also linked to bit size. If you do not want > to understand this that is your loss. > > > On 10/15/06, J. C. O'Connell <[EMAIL PROTECTED]> wrote: >> No you are wrong and so is your link if that's what >> You think it is saying. No matter what dynamic >> Range you want to capture, its possible to do it >> With any number of bits (or bit depth ). The greater >> Bit depth just allows better fidelity (more gray >> Steps total) but it doesn't determine the maximum >> And minimum recorded signal levels which is what dynamic >> Range is. >> jco >> >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of >> Perry Pellechia >> Sent: Sunday, October 15, 2006 2:00 PM >> To: Pentax-Discuss Mail List >> Subject: Re: K10D 22 bit A/D conversion >> >> No you are wrong. Dynamic range determines how small a signal you can >> detect in the presence of a larger signal. Bit depth determine >> dynamic range. If is a matter of definition and not open to >> interpretation. >> >> Do yourself a favor and do some research before you start making >> statements that are wrong. You are only making a fool of yourself. >> Stick to the K/M arguments. >> >> >> >> http://en.wikipedia.org/wiki/Dynamic_range >> >> On 10/15/06, J. C. O'Connell <[EMAIL PROTECTED]> wrote: >>> 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 >>> >> >> -- >> <----------------------------------------------------> >> 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 >> > > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
