[sane-devel] Avision AV220 Questions (LED digit, Buttons, Backends, Paper size)

[Crypto]

On Sunday 01 February 2009 22:34:10 Jeffrey Ratcliffe wrote:
> 2009/2/1 Crypto <crypto at online.de>:
> > 2.) In scanning software such as gscan2pdf etc. there is an option to set
> > contrast and brightness. Brightness goes from -100 (I suppose to make
> > scans darker) to +100 (makes scans brighter). I can set this option to
> > positive values and get brighter scans, but when I attempt to get darker
> > scans I get an error message "Unknown message: Argument "" isn't numeric
> > in subtraction (-) at /usr/bin/scanimage.pl line 357". This also happens
> > if I use different backends for scanning such as scanadf.pl. In
> > scanadf.pl it's line 380 but same error otherwise.
>
> This is a bug in gscan2pdf. If you post the output for
>
> scanimage --help
>
> I'll try and reproduce it.
>
> Regards
>
> Jeff


Jeff,

I have run the command 
scanimage --help -d avision

which gives all options available for this particular model.
I noticed that I could enter an --overscan-bottom and an --overscan-top 
command to explicitely get slightly more scanned area than the paper itself 
covers. I guess that this would help me get around the problem of slightly 
cut-off pages, as I described in my other posting here.

There is also an --infra-red option etc. to scan with infrared light, probably 
to avoid dust being scanned  (never knew my scanner would offer that, maybe 
in fact it doesn't, but I don't know).

How would I use these options from within gscan2pdf? Which options do You set 
for scanning from gscan2pdf?

Regards,
Crypto.