Re: [Leica] off-topic: Scanner's noise and depth

["Bruce R. Slomovitz" <brslomo@erols.com>]

Vielen Dank Christoph!  Es ist wirklich wahr dass man jeden Tag etwas neues
lehrnt, oder?

Slomovitz
- -----Original Message-----
From: c.blaue@bmsg.de <c.blaue@bmsg.de>
To: leica-users@mejac.palo-alto.ca.us <leica-users@mejac.palo-alto.ca.us>
Date: Thursday, April 23, 1998 6:19 AM
Subject: Re: [Leica] off-topic: Scanner's noise and depth


>
>There has been a question concerning translation of some scanner related
>stuff. This led to some misunderstandings of the notions of 'noise' and
>'depth' since it was by far not clear what was meant. I dug in my small
>archive and found the following terms of interest
>
>Bruce R Slomovitz <brslomo@erols.com> writes:
>     > Tiefenzeichnung means something like the way it draws or shows
depth.
>'Depth' or sometimes even (erroneously) 'depth of field' means just shadow
>detail. The possibility to extract from underexposed slides a wonderful
>print. Many scanners seem to have problems here.
>Sometimes it is something like colour saturation, which is a similar topic
>concerning a single colour
>
>     > Rauschen could mean a noise or murmur or it could mean interference
>     > (i.e.  electrical).
>
>The notion of noise comes from the times when we still listened to the
>radio. Noise was all the things we could hear but which noone produced on
the
>other side of the non existant wire.
>
>When TV came up noise got the meaning of snow in the picture. Strongest to
be
>seen if no channel at all is selected.
>
>With scanners noise got a similar, yet better defined meaning:
>Given a monochrome area, some pixels still differ in colour. The maximum
>difference between single pixels in the area is the noise we are talking
about
>in this context.
>
>christoph
>
>