Archived posting to the Leica Users Group, 2000/10/29

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Subject: RE: [Leica] Digital progress
From: Austin Franklin <austin@darkroom.com>
Date: Sun, 29 Oct 2000 10:01:34 -0500

> Conventional estimates say that a 35mm negative has about 20Mb

I do not believe that's close.  If depends on if you are talking about B&W 
(which only has one value/pixel) or color (which has 3 values/pixel).  It 
also depends on film.  You might be ballpark for some 6400 speed B&W film, 
but certainly no where near for a 100 speed film.

I would strongly urge you to do the arithmetic your self.  Pick a good 
film, take the grain size and see how many grains are in the image 
area...and multiply by either 2 or 4.  That'll give you a good estimate. 
 It's a heck of a lot more than 20M.  You don't have to be really anal to 
see your 20M number is way off...