Re: Xsane questions and wish list

Peter Kirchgessner (peter@kirchgessner.net)
Sun, 18 Jul 1999 17:06:46 +0200

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Steve Gunnell wrote:
>
> Oliver Rauch wrote:
>
> > xsane uses the gamma bit depth the backend uses,
> > but the scanner gamma table has to be activated (normally
> > by custom gamma table in standard options, but backend dependent)!
>
> I'm just using the default settings. I assumed the scanner was beingchanged
> because when I closed xsane and went back to xscanimage
> my attempts to correct the white level in xsane were still being applied
> to the xscanimage previews. I had to turn the scanner off to clear them.
>
> > Check it in the info window (gamma correction by scanner!)
>
> Will do.
>
> > Ask the backend author about the supported bit depth!
>
> The Photosmart FAQ indicates that at my firmware rev the scannerwill only
> return 8 bit values to the host but the A/D converter handles
> at least 10 bit values. Lets hear it for crippleware.
> ...

Hi Steve,

the R032 firmware reports 24 and 30 bits capability of the scanner, but
no tone map support which is used as a gamma map. The gamma map is
simulated by software on those scanners. But only for 24 bits (as you
have seen in the sane-hp manpage).
You can supply me with a 30bit capable HP-scanner and I can try to add
the simulation for 30 bits too if noone else will do it.

>...
>
> Thanks,
>
> Steve Gunnell
>
> --
> Source code, list archive, and docs: http://www.mostang.com/sane/
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-- Peter

-- Peter Kirchgessner WWW: http://www.kirchgessner.net e-mail: peter@kirchgessner.net

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