> > than 1/100" so ok. 250dpi then.
>
> You're still going to get shitty quality. Why skimp on something that is
> supposed to be a preservationary resource for the future?
>
But I don't. I get good quality. It's the information I want to preserve,
not the physical document. ASCII would do.
> Your data set is way too limited to be making a valid judgement.
>
Examples don't need to be comprehensive.
Lee.
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> What the hell is a Commodore 2500?
>
Big box Amiga.
Lee.
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> > My OCR does fine at 150 dpi on nearly everything
>
> That's what counts.
>
Which, I think, is where I came in ...
> A good context sensitive OCR program should be able to operate
> at well BELOW the source resolution -- it needs to differentiate
> the characters, not necessarily see all features. (for example:
> serifs) And with good enough context sensitivity, a lot of them
> can be interpolated even if not recognizable.
>
150 dpi scan, red filtered, greyscale and contrast enhanced makes for
good text and line drawing reproduction. Printed out on a halfway good
printer, an HP Laserjet, interpolated to 600 dpi, and it looks better than
the original.
> > This message has been checked for all known viruses by Star Internet
....
> Is Outlook, etc. so incredibly porous that it's necessary to scan plain
> text messages??
>
It's corporate parano^h^h^h^h^h^h policy, but I didn't know it was on
outgoing mail as well. Must remember to encrypt outgoing viru^h^h^h^h
e-mails in future.
> Are you the one whose system sends an automated response every
> time somebody sends an infected attachment to the list?
>
I don't know. I do know I get sent a "Someone has tried to send you
unauthorised code" warning e-mail instead of the original message.
Then, if I want to see the message, I have to e-mail Star and they
e-mail me back a disclaimer form which I have to print out, sign and
fax it back. Then go to a web page and use an id number and
password, which is only e-mailed to me after they get the fax, to
retrieve the message. They won't even Cc the text of the message
to me without all this hoop jumping.
Lee.
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> How is your OCR doing? THAT might be a better measure for
> whether what you are doing is working.
>
My OCR does fine at 150 dpi on nearly everything and is much
faster than working with 600 dpi source. The spellchecker gets
most of the errors. It has to, I can't spell.
Lee.
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> 70 DPI would be something like a 9 pin dot matrix printer.
>
The definition on those 9 pin dot printers is about 100dpi but the
resolution is much less, possibly less than 50 dpi. The Transtel
printer here is lucky if it can print a straight line.
> If a manual was phototypeset on a CAT phototypesetter (most
> popular phototypesetter in the publishing industry in the mid
> 70's.) then the resolution is 2000dpi (they spec it in lines/
> millimeter but my recollection is that it was about 2000lines/
> inch after conversion) so those manuals should be scanned at
> 4800 dpi right?
>
No, the resolution may be 2000 lines/inch, the definition won't be.
I doubt you'll find any feature, even on good copy, smaller than
1/250". On old manuals I would be suprised to find much, if any
detail smaller than 1/100" so ok. 250dpi then.
> Basically, I think you may be mistaken on a few of your numbers.
>
Not really, just looked a two books, TI TTL data book 1979 and
Radio valve data 1966. The TI book gets to about 125 dpi at best,
but is on coated paper. The Radio valve data book barely manages
80 dpi and is on uncoated paper, typical for manuals.
>Scanning at just over twice the source resolution is the best you
Hmmm ... for "resolution" read "definition" .. well it is 3AM. 8^)=
Lee.
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Hello,
Does anyone know anything about a franklin pc 8000 computer? I
sure don't. I was just curious if its worth keeping around.
Thanks
Luke Cashdollar
Thanks to everyone who replied!
So far, the verdict is the following:
1) the modular systems are NGEN from Convergent Technologies; they have 80186
cpus, which make them B25 modules (thanks, Paxton) or CM001/8; they do
operate from 36V externally supplied by one or more brick-style
power supplies with RJ-style connectors; no hard disks were found with
these, although, considering the manufacturing time frame, it is
conceivable that they were entirely floppy-based; these units
had dual floppy disk drives attached. I hauled a box
with lots of docs and diskettes, but I have not had the time to
go through it; the stuff might not be related to the Convergent systems.
So, I need to (a) find a way to provide these systems with 36VDC,
and (b) look for any related floppies; it may be that these machines
can't be used without a password.
2) The Datapoing 1550 seems to be a diskless computer; there is a connector
in the back that might have been used to connect a floppy disk drive
or something else. I have spotted a couple of burned caps in the
power supply (the computer smelled, so it was clear from the
beginning that I could not take the chance of turning it on unchecked).
There is a card cage in it, but I haven't taken anything but the
cover off.
carlos.
--
Carlos E. Murillo-Sanchez email: carlos_murillo(a)ieee.org
Universidad Autonoma de Manizales, Manizales, Colombia
Hi,
On Fri, 22 Jun 2001 Bill Bradford wrote:
> > Your best bet is to take the books and have the binding cut off
> > professionally. Then scan in the pages one at a time (not two). I
> > personally believe Adobe Acrobat is the best way of doing this. Although
> > I realize there are people here that are against Adobe Acrobat.
>
> I'm scanning them in as 100dpi grayscale GIFs, then I will convert to
> other format(s) and eventually to PDF. Scanning directly to PDF with
> HP's software produces horrible output with compression artifacts.
100dpi is too low a resolution; it is little above monitor screen resolution,
and small text may be illegible. Future OCR-ing of the scans would likely be
unsuccessful too.
A better alternative is to scan at a reasonably high resolution in monochome
(two colours, black and white), say 300dpi or 600dpi.
Most viewer software renders the scanned pages on-screen in greyscale anyway,
and output when printed on paper is far better. Bilevel images compress
losslessly very well, *much* better than greyscale.
If there is spot colour in the original, it would in theory be possible to
scan at equally high resolution with little impact on file size. (E.g.
VAX/VMS manuals have some text in red, so there are essentially three
colours; white, black and red.) You would have two images which could be
overlaid on each other. If anyone knows of a software package that will work
like that, please let me know.
Depending on your scanner and the paper thickness, you may find that text from
the opposite side of the page "shines through", especially in greyscale
images. You can put a sheet of black card or similar on top of the page to be
scanned to reduce this effect.
-- Mark
A few days ago one of the storage rooms at the university
was cleaned up and I grabbed all the computer-related stuff
that I could. Not a lot of variety, though. Besides
>from the wintel carcasses and Mac plus remains, I found
one Datapoint 1550 and several modules from a type system that
I have never seen. The cpu, floppy disk drives and graphics
modules snap onto each other's side very neatly. There are
several of these systems, with the corresponding monitors and
keyboards. Alas, the only power supply unit that I found
is incomplete and badly damaged. Do you guys have some
info about these systems? Pics can be found at
http://jimulco.autonoma.edu.co/~carlos/hp/datapoint_1550.jpghttp://jimulco.autonoma.edu.co/~carlos/hp/modularsystem.jpg
These pics are about 70K. They'll probably load slowly;
we're bandwidth-starved these days.
--
Carlos E. Murillo-Sanchez email: carlos_murillo(a)ieee.org
Universidad Autonoma de Manizales, Manizales, Colombia
Hello,
> I'm scanning them in as 100dpi grayscale GIFs, then I will convert
to
> other format(s) and eventually to PDF. Scanning directly to PDF
with
> HP's software produces horrible output with compression artifacts.
100dpi is too low a resolution; it is little above monitor screen
resolution,
Scanning printed material much above 150dpi is usually a waste as most
printing is done at about 70dpi.
Lee.
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