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

[m. allan noah]

I'm not familiar with the genesys code- but the logs make it look like
an additional read from the scanner is done when despeck is turned
off. The current sanei_magic implementation requires that the entire
image be buffered in the backend, so it's not unusual for a different
code path to be taken, exposing different bugs. Let see if stef has
any thoughts.

allan

On Sat, Jan 29, 2011 at 3:26 PM, Brian Shaver <shakerlxxv at gmail.com> wrote:
> 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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>> >
>>
>>
>>
>> --
>> "The truth is an offense, but not a sin"
>
>



-- 
"The truth is an offense, but not a sin"