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

[Jeffrey Ratcliffe]

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