It is amazing how many comparisons is made from film
to digital. One question I make myself many times is
how do we define the amount of data the regular film
has? In the digital world it is simple because the
information is sampled (bits). So, we know exactly the
amount of data the ccd generates. Say a 6 Mpixel camera
that can do 24 bits of color per pixel has about
6M * 24 bits = 6M *8bytes ~ 48MB of data/photo in raw
format. And about film? how do we define it? Answer:
it is near impossible. Why? because it is not digital, it
is statistical. How many grains do we have on a
iso 100 film? It could vary from frame to frame. The
density could vary in different positions of the same
frame. I read once that a typical film has about 17M
grains/layer on it. If a film has only three color layers
with 17M grains on each, it is about 17M * 3layers ~ 51
M bits (each grain is only one bit, exposed or not). In
this case, it is about 6.3 Mbyte equivalent to digital
data only. If it is correct, digital have much more data
inside one frame. But it does not mean more quality, of course.
Because the grains are statistically spread over the
film, the result is much more realistic for our eyes. And,
I think the color rendition is much better than digital because
of dark noise, response curve, etc etc etc.
Alex
[EMAIL PROTECTED] wrote:
>
> In a message dated 7/25/01 12:49:57 PM Eastern Daylight Time,
> [EMAIL PROTECTED] writes:
>
> << I'd like to know how you work that one out... >>
>
> But "Dr. Digi" ought to know!
>
> How many MB of data in a small format CCD or CMOS-3? 6?
> Even interpolated, it only works out to 12 MB or so.
>
> Some 1 pass medium format digital backs can do up to 20 MB (raw).
>
> In any case, a 24 x 36 negative/slide has gobs more data than a small format
> CCD/CMOS.
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Alexandre A. P. Suaide, Ph.D. mailto:[EMAIL PROTECTED]
STAR/EMC Research Group Phone: 1-313-577-5419 (Detroit)
Department of Physics and Astronomy Phone: 1-631-344-7635 (BNL)
Wayne State University
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