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
Nice one Cyril
----- Original Message -----
From: "Shough, Dean" <dean.shough@lmco.com>
To: <dickbo@btopenworld.com>
Sent: Monday, June 10, 2002 7:11 PM
Subject: [filmscanners] RE: Density vs Dynamic range
... 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
----------------------------------------------------------------------------------------
Unsubscribe by mail to listserver@halftone.co.uk, with 'unsubscribe
filmscanners'
or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or
body
|
