[sane-devel] HP 2300C: impossible to get extras functionnalities from scanimage
stef.dev at free.fr
Sat Apr 21 08:04:55 UTC 2012
Le samedi 14 avril 2012 14:36:38 Gauthier Vandemoortele a écrit :
> Le sam 14 avr, m. allan noah m'a écrit:
> > Threshold is only for binary (lineart) images.
> > allan
> Thanks for this 1rst explanation. But about gamma ?
> My problem is that the scan of dark photos leads to pictures where
> the loud keys are saturated («bouchés» in french); I can't retrieve
> the details by post-processing, so it's essential to collect
> lighter values during the acquisition.
xscanimage has an interactive gamma curve editor that is worth trying in
your case. You must note that gamma correction only works with a 8 bits depth,
not in 16 bits per color (it's an hardware limit).
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