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

[stef]

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 ..
> > > --
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> > > http://lists.alioth.debian.org/mailman/listinfo/sane-devel
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> > > 
> > >             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