Re: How may pixels needed to approximate 35mm film?
- From: "Ben Brugman" <Ben@xxxxxxxxxxx>
- Date: Thu, 29 Sep 2005 22:09:01 +0200
It comes to 144 lines per mm.
(No it comes to 144 pixels per mm).
But resolution for film is expressed in line pairs per mm.
144 pixels per mm can resolve about 100 lines per mm.
This is about 50 line pairs per mm.
------------------+++++------------------
(This is depending on the direction the measurement
is taken, because of the bayer pattern, it is direction
dependend, but 144 pixels in both directions can resolve
about 50 line pairs in any direction.).
How does this work. You need more than one pixel to
resolve a line. If the lines fall exactly on the pixels they
would be able to resolve a line for each pixel. But if the
lines fall exactly between the pixels you would only get
half lighted pixels which will result in a gray image.
So you need about 1.5 pixel for each line.
(Depening on the direction).
But you can turn the question around, how much 35 mm
film would you need to store say 9 Mb on (3Mp image
without compression).
ben brugman
"William Oertell" <oertell_NOT@xxxxxxxxxxx> schreef in bericht news:11jmti14u4r04e@xxxxxxxxxxxxxxxxxxxxx
> I don't know...18MP works out to 144 lines per mm, and I don't think
> there's any 200 ISO film that even comes close to that.
>
>
.
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