ðòïåëôù 


  áòèé÷ 


Apache-Talk @lexa.ru 

Inet-Admins @info.east.ru 

Filmscanners @halftone.co.uk 

Security-alerts @yandex-team.ru 

nginx-ru @sysoev.ru 

  óôáôøé 


  ðåòóïîáìøîïå 


  ðòïçòáííù 



ðéûéôå
ðéóøíá












     áòèé÷ :: Filmscanners
Filmscanners mailing list archive (filmscanners@halftone.co.uk)

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[filmscanners] RE: Density vs Dynamic range


  • To: lexa@www.lexa.ru
  • Subject: [filmscanners] RE: Density vs Dynamic range
  • From: "Shough, Dean" <dean.shough@lmco.com>
  • Date: Mon, 10 Jun 2002 11:11:33 -0700
  • Content-return: allowed
  • Unsubscribe: mailto:listserver@halftone.co.uk

... I'd like to follow this through to a definitive source.
>

The proposed ISO standard on "Photography - Electronic scanners for
photographic images - Dynamic range measurements" (WD 21550.3 (42N 4909))
states that the dynamic range is calculated by:

DR = Dmax - Dmin
DR = Scanner dynamic range
Dmax = Density where the signal to noise ratio is 1
Dmin - Minimum density where the output signal of the luminance OECF
(opto-electronic conversion function) appears to be unclipped

They go on to define a standard method for defining the signal to noise
ratio using the concept of incremental gain.  Incremental gain allows the
signal to noise ratio to be determined independent of gamma.

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



 




Copyright © Lexa Software, 1996-2009.