[sane-devel] HP 2300C: impossible to get extras functionnalities from scanimage

[Stef]

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.

	Hello,

	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).

Regards,
	Stef