[sane-devel] HP Scanjet G4010 - bad image quality
stef.dev at free.fr
Sun Aug 11 20:28:01 UTC 2013
On 11/08/2013 18:38, idle wrote:
> thank you for your replies.
> This model is listed as 'basic' in sane-backends 1.0.22. Try
> to at least 1.0.23, or a recent git snapshot.
> 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.
> 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.
> 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:
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:
Some *.pnm debug files will be created, please also send them.
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