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[OM] Re: Digital vs film resolution

Subject: [OM] Re: Digital vs film resolution
From: james king <jking@xxxxxxxxxxxxxx>
Date: Fri, 10 Mar 2006 17:23:38 +0000
Wayne S wrote:
> At 03:01 PM 3/10/2006 +0000, you wrote:
> 
>>The second way to get 256 combinations from 8 grains is if you *assume* 
>>each grain is twice the size of the next one. i.e. grains are not all 
>>the same size
> 
> 
> So you would get: 0,1,3,7,15,31,63,127,255 as values, not all 256 values.
> However this is a natural log scale and maybe closer approximation to
> what linear sensor digital data info becomes after converting. So maybe
> with emulsions, where you have variable sized grains, plus taking into
> account the log scale for brightness, film doesn't look as bad as the
> ON/OFF theory proposed in Luminious Landscape article.
> 

not if *some* grains are on and some are not then you can fill in the 
missing numbers just like 8 bits in a computer byte give 256 combinations...

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