[pure-silver] Re: Rumors Of Film's Death Are Vastly Exaggerated
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 15 Sep 2010 12:32:10 -0700
----- Original Message -----
From: "titrisol" <titrisol@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, September 15, 2010 10:04 AM
Subject: [pure-silver] Re: Rumors Of Film's Death Are Vastly
Exaggerated
noise? I think that makes no sense.
Since the images are made by sikver grains is a more
accurate representation of reality!
Noise is actually a pretty good way to describe the
effect of grain. It is an essentially random pattern
convolved with the desired image. The relationship of grain
with noise dates to the earliest use of photographic sound
recording. There the grain pattern results in "ground noise"
or the background hiss. Of course, grain also affects
resolution and in photographic sound recording the film is
being pushed about to its resolution limit.
Kodak has a good treatice on graininess and
granularity, which are not the same thing. Its probably
still on their web site. The measurement of graininess is
beset with the problems of lack of standards. Kodak has
established its own, which are used for the graininess index
published with film data. However, its important to
understand what is being measured since some statements of
graininess can not really be compared with others.
Noise in digitally encoded material is quite complex.
Much of it is caused by sampling and encoding errors.
Digital recording is not continuous, rather it is sampled
and encoded as numerical values so that to generate a
continuous fuction some interpolation must be applied in the
deconding. However, a normal analogue recording of an image
on film is also not continuous, rather it is "sampled" by
the characteristics of the film grain. The discontinuity is
one measure of "noisiness".
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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