Janusz S. Bien schrieb: > The original scans converted to DjVu DjVu looks interesting (http://www.djvuzone.org/). Thanks for that hint, I didn't know it before.
> Although the processing improved the images in some respects, in > general the result seems to me less readable then the > original. The dirty artefacts around letters are strange. Do you think they originate from unpaper's processing? I placed an unprocessed page from your djvu-file to http://user.cs.tu-berlin.de/~jgulden/unpaper/archive/20050621JanuszBien/03.pbm and processed it with unpaper -vv --layout single --mask-scan-threshold 0.4 --black-threshold 0.3 --border 0,100,0,0 03.pbm 03up.pbm The resulting file is http://user.cs.tu-berlin.de/~jgulden/unpaper/archive/20050621JanuszBien/03up.pbm Do you get the same result on your system from the same unpaper run? (Btw, the additional '--black-threshold 0.3' is supposed to lead to slightly more saturated black color in the output. A matter of taste, I guess.) Hope that helps, Jens
