My ScanJet 7450C scanner now works on my Redhat 8.0 system with avision backend.
I found http://www.xsane.org/doc/sane-xsane-doc.html and learned what line-art mode means. When I scanned in line-art, I got the positive black and white image that I wanted. However, the black/white threshold does not look right, and I could not find a way to adjust it. The doc file mentions enhancement options, but I could not find a way to set the options to make the threshold adjustable. I executed scanimage --help -d avision:/dev/scanner, but found no options which appear to be related to the black/white threshold. Is there any way to do this?
