Hi Kelly,
no, I'm not scanning text for OCR, I receive some documents per Mail
that I need to sign, scan and send back. When the document is printed on
both sides, the back side shows up if I don't adjust the brightness. I
haven't tried to process it in the PC, though. Maybe that works too.
I would love to force the scanner to not auto-adjust, but I don't know
how to do that. Or how to force it to auto-adjust for that matter. All I
know is that with my Epson printer/scanner and the epkowa backend I have
a lot of options including adjusting the brightness. If I set that to a
value between 30 and 40 I don't get the back of the document to show
through. I would like to be able to do that in the new scanner as well.
All I use Imagemagick for is the conversion of the huge .tiff out of the
scanner to a still big, but acceptable in most cases, .pdf.
On 08.09.20 16:53, Kelly Price wrote:
I take it you're scanning text for OCR?
Consider it line art, and take some advice from Sean Michael Robinson
in the Cerberus The Aardvark Restoration Project.
http://momentofcerebus.blogspot.com/2017/02/paper-to-pixel-to-paper-again-part-five.html
In short:
* Scan in 24-bit color. It doesn't slow it down.
* Set the brightness/saturation/contrast/gamma to the defaults, and
don't touch 'em.
* Force the scanner to not auto-adjust.
* Your PC is better at adjusting the color values and forcing it to
greyscale than the scanner is.
To which I add:
* ImageMagick and some shell scripting can bulk-process anything.
On Tue, Sep 8, 2020 at 10:32 AM Andrea Croci <[email protected]> wrote:
Hi Alexander,
thank you for your reply. That did work indeed: the scanner gets
recognised as 'airscan:e0:Canon MF745C/746C'. However the list of
options for that device is very short. For instance there is no
"brightness", which would be very helpful when scanning a page printed
on the backside too. That's what I always have to adjust with the Epson
scanner in order not to see the back printing through.
In addition I just checked in my laptop, which has Ubuntu 20.04
installed instead. That has recognised the scanner automatically with
the "escl" backend. I don't see an "escl.conf" in my desktop with 18.04.
Is this just a matter of sane-version?
Is there any way to activate other functions for the scanner?
Thank you and regards,
Andrea
On 08.09.20 12:30, Alexander Pevzner wrote:
Hi Andrea,
On 9/8/20 7:20 AM, Andrea Croci wrote:
I have just installed a new Canon iSensys MF746Cx on Ubuntu 18.04 and I
can't get it to scan. It' connected over the network. I haven't found
any driver or software for scanning on Canon's Website, so I was hoping
I could do it with sane. I have read on the list of supported devices
that the MF741/743 are fully supported by the pixma backend.
The sane-airscan will probably work for you:
https://github.com/alexpevzner/sane-airscan - the project page
https://download.opensuse.org/repositories/home:/pzz/ - binary
packages for many distros
