[sane-devel] HP Scanjet G4010 - bad image quality

[idle]

Hello,

I enabled the debug traces and scanned an image. The debug log is here:
http://pastebin.com/XGEE8qUW
I uploaded the resulting image here:
https://docs.google.com/file/d/0B1vsOamDoU0IVGJBRjB4NGE0THc/edit?usp=sharing

I hope it is what you asked for.

Eva



On 11 August 2013 22:28, Stef <stef.dev at free.fr> wrote:

>  On 11/08/2013 18:38, idle wrote:
>
> Hello,
>
>  thank you for your replies.
>
>
>    This model is listed as 'basic' in sane-backends 1.0.22. Try upgrading
>>> to at least 1.0.23, or a recent git snapshot.
>>>
>>> allan
>>>
>>
>  I'm trying now with the git snapshot:
> scanimage (sane-backends) 1.0.24git; backend version 1.0.24
>
>  Unfortunately, the result is the same.
>
>
>>        Hello,
>>
>>     if updated version doesn't improve the scan quality. You may also
>> test if it is related to improper warming up by doing several scans.
>> Clearing calibration (with the 'clear calibration' option)cache between
>> each scan, so a calibration happens each time.
>>
>> Regards,
>>     Stef
>>
>
>  Thank you for the suggestion, I tried a series of 10 scans, clearing the
> calibration after each one, and the result is interesting. The first scan
> of the series is visibly lighter than the rest (although still too gray),
> the second and third are each slightly darker than the previous one. All
> the following scans are the same as the third. So there is something going
> on. The stripes are still there, though.
>
>  Here are the first three scans:
> http://i.nahraj.to/f/s5o.jpg
>  http://i.nahraj.to/f/s5p.jpg
>  http://i.nahraj.to/f/s5q.jpg
>
>  Eva
>
>     Hello,
>
>     it seems gain calibration isn't good, resulting in poor shading
> calibration. Could you send the debug log generated when debug traces are
> enabled by:
> export SANE_DEBUG_GENESYS=255
> export SANE_DEBUG_GENESYS_LOW=255
> export SANE_DEBUG_GENESYS_GL646=255
> Some *.pnm debug files will be created, please also send them.
>
> Regards,
>     Stef
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20130811/ad64eab5/attachment.html>