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From: rthomson@mesa.dsd.es.com (Rich Thomson)
Newsgroups: comp.graphics
Subject: Re: Generating photographic grain imperfection in computer graphics?
Message-ID: <1991Apr12.183031.12462@dsd.es.com>
Date: 12 Apr 91 18:30:31 GMT
Article-I.D.: dsd.1991Apr12.183031.12462
References: <5644@media-lab.MEDIA.MIT.EDU>
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In article <5644@media-lab.MEDIA.MIT.EDU>
	ereidell@media-lab.media.mit.edu (Evan A. Reidell) writes:
>[...]  why we can
>recognize the difference between a black-and-white movie made in the 50s
>and a black-and-white movie made today, within seconds?

When I worked in a movie theatre I learned that different film stock
degrades over time in different ways.  Technicolor is nice because it
keeps its colors "bright" without much decay.  Other film stocks can
fade to a purple color, even when the original movie was black and
white.  These may be the differences you're seeing between old B&W movies 
and new ones.  Film stock has changed considerably in the past 40
years, I imagine.

						-- Rich
-- 
  ``Read my MIPS -- no new VAXes!!'' -- George Bush after sniffing freon
	    Disclaimer: I speak for myself, except as noted.
UUCP: ...!uunet!dsd.es.com!rthomson		Rich Thomson
ARPA: rthomson@dsd.es.com			PEXt Programmer