[sane-devel] Canon LIDA 20 (plustek) scan quality

[Gerhard Jaeger]

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 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.

> 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