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

[Stef]

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


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