Scanning docs for bitsavers

[Christian Corti]

On Wed, 27 Nov 2019, Paul Koning wrote:
>> On Nov 27, 2019, at 2:56 PM, Jason T via cctalk <cctalk at classiccmp.org> wrote:
>>
>> On Wed, Nov 27, 2019 at 10:12 AM Christian Corti via cctalk
>> <cctalk at classiccmp.org> wrote:
>>> My recommendation: use a proper multi-function copier (the big copiers)
>>> that can also scan to network. I currently use our big Konica-Minolta
>>> bizhub 754. Although it'a b/w copier, it can also scan in color. This
>>
>> These are great for cranking through big stacks of paper, but watch
>> out for the presets.  Some (like the older Xerox I used to use at
>> work) would scan to "TIFF"...which was really a JPG-compressed image
>> in a TIFF wrapper.  So even my 600dpi bilevel scans would have
>> compression artifacts.
>
> Another problem with bilevel scans is that, on some machines at least, 
> they can be very noisy.  That's what I saw on the copier/scanner at the 
> office.  For good scans I use gray scale scanning, with post-processing 
> if desired to convert to clean bilevel data, without all the noise. 
> Not only does it make looking at the material more pleasant, but it also 
> makes the files much smaller -- noise doesn't compress well.

You both are right, and I had to make the proper settings for getting 
clean b/w TIFF files without noise in black parts, but it is possible. And 
the bilevel TIFF files generated are G4 compressed.

Christian