24 Jul
2019
24 Jul
'19
1:45 a.m.
-----Original Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Paul Koning via
cctalk
Sent: 24 July 2019 01:30
To: Jon Elson <elson at pico-systems.com>; General Discussion: On-Topic and
Off-Topic Posts <cctalk at classiccmp.org>
Subject: Re: Scanning question (Is destruction of old tech docs a moral
crime?)
> On Jul 21, 2019, at 12:16 PM, Jon Elson via cctalk
<cctalk at
classiccmp.org>
wrote:
oddball
On 07/21/2019 05:16 AM, Joseph S. Barrera III via cctalk wrote:
But, some contain hand-drawn schematics where an 11 x 17 original has been
shrunk to 8.5 x 11" and hand-written signal labels and part types are VERY
small. These need to be scanned at high resolution, with several retries
while adjusting the image threshold to make things readable.
Another example that might call for higher than normal resolution is What dpi qualifies as not "crappy"?
300dpi? 400? 600?
Most of the text of these documents don't need super high resolution. text, where subtle distinctions need to be visible.
An example of this
can be
found in the scans in the Knuth archive of the THE
operating system
sources.
Those are line printer listings printed with a typical
medium-worn ribbon
--
that's bad enough. But the printer is upper case
only printing mixed-case
source material. That was handled in that OS by overprinting upper case
letters with periods. In a clean original printout that's easy enough to
see,
but the scans seem to be about 300 dpi and with that
the overprints are
often not easy to see. Since the source text is case sensitive this can
be a
problem...
paul
I think you folks are forgetting that often the choice is scan and have a
record, or just put it in for pulping.
Storing paper is not easy and not cheap. I deeply regret binning my Wireless
World magazines from the 1970's or 1980's but there is no way I could keep
them
When I offer documents on here or other platforms frequently no one is
prepared to take them (I am in the UK).
The same goes for some physical objects such as printers.
If you want it to be a crime then start a crowd sourcing fund to save it....
Dave
G4UGM