[sane-devel] A couple issues with genesys HP G4010

[Brian Shaver]

Thanks Stef!

Let me know if you'd like any additional information, or if I can be any
help with the fix.

Thanks,
Brian ..

On Sun, Jan 30, 2011 at 2:36 AM, stef <stef.dev at free.fr> wrote:

> Le Saturday 29 January 2011 21:26:03 Brian Shaver, vous avez écrit :
> > allan,
> > If I comment out the function call which was causing the crash, then I'm
> > able to run with a high genesys debug level. This function call was just
> > for debug purposes to create the "unprocessed.pnm" file. The following
> > commands were executed with:
> >
> > SANE_DEBUG_GENESYS=255
> > SANE_DEBUG_SANEI_MAGIC=255
> >
> > ./scanimage --mode Lineart --resolution 100 -l 21.4 -t 79.7 -x 148.7 -y
> > 138.9 --swdespeck=yes > /tmp/despeck.pnm 2> /tmp/despeck.log
> >
> > ./scanimage --mode Lineart --resolution 100 -l 21.4 -t 79.7 -x 148.7 -y
> > 138.9 > /tmp/no_despeck.pnm 2> /tmp/no_despeck.log
> >
> > Attached are the images and log files. The black band at the bottom of
> the
> > despeck image does not change size based on the despeck value.
> >
> > Thanks,
> > Brian ..
> >
> > On Sat, Jan 29, 2011 at 11:30 AM, m. allan noah <kitno455 at gmail.com>
> wrote:
> > > brian- I did not write the genesys backend, but I did write the
> > > sanei_magic library that it uses to provide the swdespeck option. It
> > > would be interesting to see a low resolution version of the two
> > > images, and a log with:
> > >
> > > SANE_DEBUG_SANEI_MAGIC=255
> > >
> > > combined with whatever the highest debug level genesys will give
> > > without crashing.
> > >
> > > allan
> > >
> > > On Fri, Jan 28, 2011 at 8:19 AM, Brian Shaver <shakerlxxv at gmail.com>
> > >
> > > wrote:
> > > > I'm using the Lineart mode and trying the --swdespeck option and I've
> > > > noticed its leaving a black band along the bottom of the image.
> > > > The 2nd issue, is that when I turn the debug up (
> SANE_DEBUG_GENESYS=10
> > > > ) and try the same scan, the process seg faults. The following is the
> > > > stack from the core:
> > > > (gdb) bt
> > > > #0  0x00007fa3e4ce35c8 in sanei_genesys_write_pnm_file
> > > > (filename=0x7fa3e4cec479 "unprocessed.pnm",
> > > >
> > > >     data=0x7fa3e2267000 <Address 0x7fa3e2267000 out of bounds>,
> > > >     depth=1,
> > > >
> > > > channels=1, pixels_per_line=2360, lines=3188)
> > > >
> > > >     at genesys_low.c:144
> > > >
> > > > #1  0x00007fa3e4caa60f in genesys_buffer_image (s=0x99e340) at
> > > > genesys.c:6895
> > > > #2  0x00007fa3e4caccab in sane_genesys_start (handle=0x99e340) at
> > > > genesys.c:7864
> > > > #3  0x00007fa3eae33ae2 in sane_dll_start (handle=0x99b2a0) at
> > > > dll.c:1263 #4  0x00007fa3eae20d38 in sane_start (h=0x99b2a0) at
> > > > dll-s.c:48 #5  0x0000000000406d1c in main (argc=13,
> > > > argv=0x7fffe2b73a08) at scanimage.c:2283
> > > >
> > > >  The code is trying to write out a file ( unprocessed.pnm )
> containing
> > >
> > > ... I
> > >
> > > > think the Lineart converted data before performing the despeck
> process.
> > > > I'd be happy to help with a fix for this, or provide further
> > > > information
> > >
> > > or
> > >
> > > > testing.
> > > > Thanks,
> > > > Brian ..
> > > > --
> > > > sane-devel mailing list: sane-devel at lists.alioth.debian.org
> > > > http://lists.alioth.debian.org/mailman/listinfo/sane-devel
> > > > Unsubscribe: Send mail with subject "unsubscribe your_password"
> > > >
> > > >             to sane-devel-request at lists.alioth.debian.org
> > >
> > > --
> > > "The truth is an offense, but not a sin"
>
>         Hello,
>
>        thanks for providing these detailed information. For the crash, the
> image
> writing function doesn't handle line art bitmap format. I'm currently
> fixing
> that. For the black band, it is due to incorrect settings in registers in
> line
> art mode which makes the backend reading too much data from the scanner.
> This
> extra data is filled with 'noise'. I am currently looking into that.
>
> Regards,
>         Stef
>
>
>
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