[sane-devel] sane-genesys options

[c...... g......]

> Gesendet: Freitag, 27. September 2013 um 21:16 Uhr
> Von: Stef 
> An: "c.. g.." , sane-devel at 
> lists.alioth.debian.org
> Betreff: Re: [sane-devel] sane-genesys options
>
> On 27/09/2013 13:50, c.. g.. wrote:
> > Hi,
> >
> > is it possible to modify the calibration offsets for the genesys backend? I 
> > could not find any documentation for this. I know that the calibration is 
> > written into a file ~/.sane/...  What is the format of this file?
> >
> > Thanks,
> > Christian
> >
>  Hello,
> 
>  there is a make target to generate doxygen files from the genesys 
> backend. The file only stores the result of calibration. I don't think 
> you want to modify it directly.
>  Why are you trying to modify offsets ?
> 
> Regards,
>  Stef
> 

Hi Stef,

thanks for your reply.

The need to override the automatic calibration settings stems from my special 
use of the scanner (hp g4050). I try to scan in two different modes, one with 
the internal light on, the other with the internal light off and an external 
infrared source on. (In both modes I have to keep the scanner cover open.) When 
the scanner calibrates, it uses the white calibration strip built into it's 
case. Using the calculated calibration values the images are not useable for my 
purpose because of the different lighting conditions while scanning. So I 
opened the scanner and covered the calibration strip with dark tape for 
testing. Afterwards it was possible (at least for one of the two scan settings) 
to get images which were useable but still of poor quality. I'm sure that if I 
could manually override the calibration values, it would be possible to improve 
the image quality. (some backends have options to override rgb offsets and 
gains but I think this is not true for the genesys backend?). Modifying the 
calibration file would be a temporal workaround but maybe I should implement 
the required options directly into the backend.

There is another issue I have with the IR-settings. The HP g4050 has a built in 
IR-filter which can be flipped out of the optical path by a magnetic switch. I 
think it would be necessary to do some reverse engineering to get this switch 
working. For the moment I've solved this issue by fixing the IR-filter manually 
but it would be great to have this done by the genesys backend. Can you suggest 
me some free (win7/win8 64 bit, MacOs should be possible too) software to sniff 
the usb communication?

Regards,
Christian

[sane-devel] sane-genesys options

[c...... g......]

Hi,

is it possible to modify the calibration offsets for the genesys backend? I 
could not find any documentation for this. I know that the calibration is 
written into a file ~/.sane/...  What is the format of this file?

Thanks,
Christian

[sane-devel] Solved: hp g4050

[c...... g......]

Hi,

I got the things working. The G4050 scans without light with the newest genesys 
backend from git. 
When installing the new git-version (1.0.24) the backends did not get updated 
(scanimage was still using the 1.0.22 backends). Sorry for the spam.

Cheers,
Christian

> Gesendet: Montag, 16. September 2013 um 17:21 Uhr
> Von: "c.. g.." 
> An: sane-devel at lists.alioth.debian.org
> Betreff: hp g4050
>
> Hi,
> 
> I'm in the need of a scanner, which offers the possibility to scan with the 
> lamp switched off (using an external light source for scanning). I bought a 
> HP G4050 as was suggested on this mailing list. 
> 
> When I use the sane-genesys backend with this scanner, the "--lamp-off-scan" 
> option is unrecognized (even with the cvs version). Can anyone confirm, that 
> this scanner is/will be able to scan with the lamp switched off?
> 
> Cheers,
> Christian

[sane-devel] hp g4050

[c...... g......]

Hi,

I'm in the need of a scanner, which offers the possibility to scan with the 
lamp switched off (using an external light source for scanning). I bought a HP 
G4050 as was suggested on this mailing list. 

When I use the sane-genesys backend with this scanner, the "--lamp-off-scan" 
option is unrecognized (even with the cvs version). Can anyone confirm, that 
this scanner is/will be able to scan with the lamp switched off?

Cheers,
Christian

[sane-devel] sane-genesys

[c...... g......]

Ok, sounds good. I'll give it a try as soon as I get my device.
Maybe I need to ask more questions when I dig into the source code of the 
genesys backend.

Cheers,
Christian

> Gesendet: Mittwoch, 04. September 2013 um 04:58 Uhr
> Von: Stef 
> An: sane-devel at lists.alioth.debian.org
> Betreff: Re: [sane-devel] sane-genesys
>
> On 03/09/2013 22:33, c.. g.. wrote:
> > Hi,
> >
> > @stef
> > thanks for your suggestion. Seems that the hp g4050 could be what i'm 
> > looking for.
> >
> > As i read, the hp g4050 has a built-in infrared unit for dust and scratch 
> > removal. Would it be possible to retrieve the raw infrared data when using 
> > the sane-genesys backend with an hp g4050?
> >
> > Thanks,
> > christian
> >
>  Hello,
> 
>  it should be possible, but it need to be coded.
> 
> Regards,
>  Stef
> 
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[sane-devel] sane-genesys

[c...... g......]

Hi,

@stef
thanks for your suggestion. Seems that the hp g4050 could be what i'm looking 
for.

As i read, the hp g4050 has a built-in infrared unit for dust and scratch 
removal. Would it be possible to retrieve the raw infrared data when using the 
sane-genesys backend with an hp g4050? 

Thanks,
christian

[sane-devel] special scanning purpose

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