[sane-devel] Problem with new Canon iSensys MF746Cx

Kelly Price strredwolf at gmail.com
Tue Sep 8 15:53:32 BST 2020

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.

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 <andrea.croci at gmx.de> 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
> >

Kelly "STrRedWolf" Price

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