On 7 Jan 2001, at 11:37, Juan J. Buhler wrote:
> I'm not sure I follow you math here. With a 4000dpi scanner, from a
> 36x24mm frame, you get an image that is 5669x3779 pixels. That is
> roughly 20 Million pixels. Now, the "pixels" in what digital cameras
> call "mega pixel" are actually individual R, G *or* B components.
> That is, a 6 Mpixel camera has only 6 million sensors, roughly 2
> million of each R, G and B: only 2 million "real pixels". The cameras
> interpolate the missing components to get the number of pixels they
> claim. This accounts for color artifacts in very bright, sharp
> highlights, for example.
>
> So that means that a digital camera should have to be about 60 "mega
> pixels" to equal the results one can get with fine grain film and a
> Polaroid SS4000.
>
> When you take into account film grain, you have to deal with things
> like aliasing between the grain and the scanner sampling rate, so the
> 60 megapixels probably go down to half that or so to get comparable
> results.
Having used the Polaroid SS4000 (my third film scanner over 6 years) I might
just add that from my observations I estimate that there is at least twice the
detail available in most =<100ISO films that the SS4000 can resolve. I have
come to this conclusion after comparing many 4000DPI scans to the actual
film under 40x optical magnification.
Cheers,
Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
UTC(GMT) +10 Hours
[EMAIL PROTECTED]
http://www.ozemail.com.au/~distudio/publications.html
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