Re: Digicam vs. Scanner resolutions

["Ernst Dinkla" <E.Dinkla@xxxxxxxxx>]

----- Original Message -----
From: "Phil.Lippincott" <phil.lippincott@worldnet.att.net>
To: <scan@leben.com>
Sent: Tuesday, June 11, 2002 5:40 AM
Subject: Re: Digicam vs. Scanner resolutions


> Kennedy,
>       I'm sorry this isn't an academic discussion.  Aztek has
clients doing bill
> boards from crops within 35mm.  No there is no visible grain on
the print I
> referred to. Drum scanners do not use an optics lens to see or
reproduce images.
> The concept is like a laser spot taking each individual pixel
as round (not
> square) individual and controllible samples.  Because the spot
is consolable
> independently of dpi the grain is manageable also.  By the way
8000 3 micron spots
> is approximately inch. The smallest spot I ever measured on a
CCD scanner with
> lenses was 6 micron or about 4000 dpi equivalent spot. I
included this print as
> one example of scan to print file sizes at my DIMA PMA 2002
Scanning Technology
> Round Up presentation at Orlando in March.   These kinds of
scans are being
> performed by the thousands daily at hundreds of Labs and high
photographer studio
> equipped with suitable scanners.

Does it matter what kind of scanning technic is used when the
image resolution is already reached ?
For 35 mm this could mean that you have to go to grain level and
get all the image resolution + disguising the grain as can be
done so clever on a drum scanner. But even then you will not get
more information than what was written down in grain. It may look
good but the same applies to a well done upsampling of a digital
image.

For 645 fine grain and lens may be equal on image resolution,
above that you will only find the coarser grained films that will
give a similar equal resolution or grain limited resolution.
Sticking to blow ups of 35 mm on a drumscanner as an example for
the qualities of film when comparing film/scanning and digicam
seems a bit restricted.

BTW, is there a list of filmsizes, general lens resolutions,
grain size/filmspeed etc so you could use a combination where the
image resolution is always near the grain resolution ? I know
this is more a thing you have to learn while doing it but there
must be someone with an urge to publish that.

Ernst



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