Re: Microfilm Digitization
Lee Dirks (mailto:Lee_Dirks@OCLC.ORG)
Mon, 20 Mar 1995 11:48:52 EDT
Message-Id: <mailto:199503201655.KAA01311@library.wustl.edu>
Date: Mon, 20 Mar 1995 11:48:52 EDT
From: Lee Dirks <mailto:Lee_Dirks@OCLC.ORG>
Subject: Re: Microfilm Digitization
To: Multiple recipients of list IMAGELIB
Message:
> Why can't one use preservation-quality silver halide film? Image
> quality is one problem, but the lifespan is a function of the film
> stock.
One should always use silver-halide film, but lifespan is a function
of the film stock AND THE PROCESSING. Processing the film to
preservation standards is a very complicated set of strict
procedures, and few COM producers are aware of the need for adhering
to these standards. There are other preservation issues with COM,
not the least of which is the resolution problem (Quality Index),
which does not meet preservation standards. (COM ÿI of 5;
preservation standards dictate a minimum of 8.)
-Lee Dirks, Preservation Resources