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RE: [APML] Fw: images
Hi Jason
>On the other hand, there is an expression giving the information >capacity of film..that is the bits per unit area that can be stored on a >photographic layer. Altman and Zweig (Phot. Sci. Eng. 7:173, 1963) >reported levels up to 160x10^6 bits/cm^2 for one set of fairly stringent >conditions. [...]
Hmmm... I don't know if I understood that very much... Let's supose that it is the value for TechPan, and that we can scan optimally at 4000 dpi (due the film's grain). The question is, wich bit deph do we need from a scanner to obtain all the information?
Then, we have, by comparing the information in same areas:
160E6/(1575·2^x), and we want to find x, the bit deph... and to the given conditions it is nearly 17!!!!
I know that it is a naive aproximation, but makes one to think that definitivaly we have more than 8 bits in our films... Don't? <g>
Disclaimer: Of course, I can be totally wrong <vbg>
Regards,
Carlos Milovic F.
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Astro & Photo - CMF
http://www.astrophoto.vze.com
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Visita "AstroFoto", el foro de astrofotografía en español
http://espanol.groups.yahoo.com/group/astrofoto
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