> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of graywolf > Sent: Friday, September 15, 2006 5:37 PM > To: Pentax-Discuss Mail List > Subject: Re: It is ingenious! Was: Does this mean what I think it > means? > > Lets back up a bit here. You have a sensor that has an analog out put. > You send that output to an analog to digital converter. The converter > produces an 8, or 10, or 12, or in this case 22 bit digital > representation of the analog signal. Then that digital representation > is > processed digitally. Note that the analog signal does not change. The > only difference is that the higher bit rates produce a more accurate > representation of the analog signal. There is no magic here, just > technology. > > Rephrasing that, the analog signal is simply broken up into more > digital > pieces, nothing is added to it. > > -- > graywolf > http://www.graywolfphoto.com > http://webpages.charter.net/graywolf > "Idiot Proof" <==> "Expert Proof"
Hi, I did not say the digital processing would add anything else than noise! If you look closely at the "if" part: Yes, it has to decide the exposure time and f-stop but *IF* the imaging *AND* image processing has a really wide dynamic range you can still choose the correctly exposed part of that range (choose the most fitting 12 bits space from the full 22 bit space for example). With *imaging* I mean the sensor and with *image processing* I mean the analog amplifier stage and the a/d conversion. Sorry for maybe not being very clear (English not my first language). In another e-mail to this thread I already said this was going into a bit too technical (and theoretical). I know there is no magic in the electronics design (I do it at work) but sometimes I sure feel like a magician... At least in theory (and I am sure we will see that partly in practice with the K10D), using a higher bit depth in the a/d stage is a really good thing to do. Antti-Pekka ________________________________________ Antti-Pekka Virjonen Computec Oy R&D Turku www.computec.fi -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
