Hi Frank,
I attached a patch for this issue. You need to patch the file
"backend/pixma_mp150.c".
Please report your results.
Many thanks for your help.
Cheers,
Rolf
Am 25.03.2016 um 13:25 schrieb FS:
> Hi all,
> I recently bought a Canon MG7750. And I was rather badly surprised by
> Canons own scanner driver for Linux.
> Hence, first and foremost a big thank you to the SANE developers for
> adding support for this model.
>
> Since you asked for testers I made some scans with different settings.
> All resolutions up to 600DPI work fine (http://susepaste.org/350ec6bf ).
> 1200DPI and 2400DPI work but the result looks rather strange
> (=unusable) (http://susepaste.org/a7dbf6b8 and
> http://susepaste.org/1ac92632 ).
>
> All three files should show exactly the same picture.
> For scanning only the resolution changed. No other setting was changed.
> To reduce file size I compressed the images pretty strongly before
> uploading. The 2400DPI scan is also reduced in resolution.
> Hence, quality is well below the real scan quality.
> But the problem is clearly visible.
>
> SANE backends are from sane-backends-git20160322. OS is openSUSE
> Leap42.1.
>
> I hope this information helps. I will be happy to test newer versions
> or tell you more information.
>
> Cheers
> Frank
>
>
>
--- ./pixma_mp150.c 2016-03-31 11:13:01.730683710 +0200
+++ ../sane-backends/backend/pixma_mp150.c 2016-03-31 11:13:33.432333614 +0200
@@ -1166,7 +1166,8 @@
&& s->cfg->pid != MG6300_PID
&& s->cfg->pid != MG6400_PID
&& s->cfg->pid != MG7100_PID
- && s->cfg->pid != MG7500_PID)
+ && s->cfg->pid != MG7500_PID
+ && s->cfg->pid != MG7700_PID)
reorder_pixels (mp->linebuf, sptr, c, n, m, s->param->wx, line_size);
/* Crop line to selected borders */
--
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