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.
