[sane-devel] Canon laser multi-functional support: MFNP protocol

[Michael Shigorin]

On Thu, Jul 02, 2015 at 07:54:51PM +0300, I wrote:
> > > The MF6100 series is not listed, but it again might be quite
> > > possible to get it to work.
> > The same almost white image as with 8540:
> > http://fly.osdn.org.ua/~mike/tmp/sane-pixma/Canon-MF6140dn-scanimage.ppm.xz
> 
> Silly me, it wasn't "almost white" but rather a valid scan of
> the scanner's background!  Managed not to check the actual page
> is in place, sorry for being *that* stupid that day...
> 
> Retested as of RELEASE_1_0_24-296-g0655b05 and these are the

FIX: the packages built were RELEASE_1_0_24-292-g8c51579,
updating to RELEASE_1_0_24-296-g0655b05 now.  This matters.

> results with a USB2-connected crop of Canon devices:
> 
> MF8540Cdn: scanimage OK, xsane OK (75/150/300/600, colour/bw)
>   (at least "Good" by me)
> 
> MF6140dn and iR1133if: scanimage/xsane OK _BUT_ only once, sort of
>   (might be "Basic", don't know if this passes for git)
> 
> Now there's a problem with 6140 and 1133 that looks like this:
> 
> - scanimage produces a file (which is fine);
> - second scanimage in a row hangs;
> - xsane hangs too when trying to preview/scan;
> - turning "remote scan" off and on is not enough;
> - turning the device off and on (with subsequent
>   selection of scan mode plus "remote scan") helps;
> - scanimage would hang the same after xsane;
> - several consecutive scans using a running xsane
>   instance are OK (e.g., different density).
> 
> 6140 also exhibited weird behaviour at 600dpi (the sound's also
> different from 75/150/300 which scanned just fine): the head
> might have been hitting the edge for a second or two with the
> result being gray bands along the scanning direction at the end
> of the file, I've uploaded a (8Kx5K) sample here just in case:
> http://fly.osdn.org.ua/~mike/tmp/sane-pixma/Canon-MF6140dn-xsane-600dpi.jpeg
> 
> 1133 didn't hit that (the 600dpi sound is also different) but the
> image quality suffers from some kind of a "cellular" effect, see
> http://fly.osdn.org.ua/~mike/tmp/sane-pixma/Canon-iR1133iF-xsane-600dpi.jpeg
> (300dpi and lower are fine though).
> 
> Again, 8500 had neither of these problems for me now --
> never got stuck whatever scanimage/xsane/scanimage I did,
> the image wasn't distorted, the head didn't hit anything.
> At least so far. :)
> 
> Thank you!

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