At Tue 11 Jan 2005 06:25, Gerhard Jaeger wrote: > Hi, > > On Tuesday 11 January 2005 05:41, Alvaro Figueiredo wrote: > > Hi, all. > > > > I recently bought a Canon LIDA 20, a USB scanner. It readly > > worked on my Linux 2.6 box, but its scan quality is really much > > worse than Windows 98 driver's scan output. It is a dual boot > > box. > > > > I am scanning regular text documents, like the sample bellow. > > > > scanimage --resolution 300 --mode Binary -x 210mm -y 297mm > > > > The Windows output is almost perfect, like a photocopy. The > > sane's output seems to have much less resolution and misses > > some portions of text that is not black. I am using the same > > mode (lineart) and resolution (300dpi) on Linux / sane and > > Windows. I can send both outputs, if anyone request it (near > > 150k each, in PDF). > > please send it to me. >
I made available three documents scanned on Linux (sane) and on Windows (manufacturer's driver). They are doc1???.pdf, doc2???.pdf and doc3???.pdf (??? is lin or win). I did ran a sample with debug enabled and published it all at: http://alvarof.freeshell.org/sane/ > > I have no scanning experience, but I had tried almost all > > options of scanimage without significative improvement. > > > > Am I missing something, here? > > Probably not. > > > Follow some system information. > > > > scanimage --version > > scanimage (sane-backends) 1.0.14; backend version 1.0.14 > > you might update to 1.0.15. > My Linux distro uses RPM, and I already keep it updated. I will try upgrade sane later on, with alternative packages. > > scanimage -L > > device `plustek:libusb:001:004' is a Canon N670U/N676U/LiDE20 > > USB flatbed scanner > > > > sane-find-scanner > > found USB scanner (vendor=0x04a9 [Canon], product=0x220d > > [CanoScan], chip=LM9832/3) at libusb:001:004 > > Could you please to the scan again, enabling the debug output, > and send me that too? export SANE_DEBUG_PLUSTEK=20 > > Ciao, > Gerhard I did not scanned color pictures yet. I do not know if it presents some anomaly. Please, let me know if I may help you with more information or if I could make more tests. Thank You by your attention. -- Alvaro Figueiredo [email protected]
