[filmscanners] RE: Newish Digital Tech

["Robert Meier" <filmscanner@meierlim.com>]

>-----Original Message-----
>From: filmscanners_owner@halftone.co.uk
>Err....aaaa...  Hum.  You have to add the noise floor to it though.  For a
>noise floor of 25:
>
># of Electrons Noise
>
>10                     25+sqrt(10)     = ~28
>20                     25+sqrt(20)             = ~29.5
>
>100                    25+sqrt(100)    = ~35
>200                    25+sqrt(200)    = ~39
>
>1000                   25+sqrt(1000)   = ~57
>2000                   25+sqrt(2000)   = ~166
>
>10000                  25+sqrt(10000)  = ~135
>20000                  25+sqrt(20000)  = ~166
>
>I’m not seeing a sqrt(2) in noise increase for a doubling of electrons
>here...but clearly the SNR is better as the signal gets larger, for one
>reason because the noise floor is increasingly less of the overall signal,
>so of course that happens.

Well, since the original poster was talking about photon noise I was only
mentioning photon noise and for that my statement is true. Now you come and
talk about floor noise. As you argue your case I could argue that your
numbers are wrong because you forgot other sources of noise, etc. I agree
that you can't look at photon noise only but I just was guessing about what
the original poster was talking about. But the point here is that no matter
what anybody says you always turn things around so that it looks wrong and
what you say is right. End of discussion for me...

Rob

----------------------------------------------------------------------------------------
Unsubscribe by mail to listserver@halftone.co.uk, with 'unsubscribe 
filmscanners'
or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or 
body