[sane-devel] HP scanjet 2300c

Stéphane VOLTZ stefdev at modulonet.fr
Sun May 7 06:01:38 UTC 2006

Le Samedi 6 Mai 2006 00:02, Michael Schachtebeck a écrit :

> ok, I'm using the daily cvs snapshot now, and even the command
> scanimage --mode Color -y 20 > scan.pnm
> drives the head very fast to the end until it "crashes" instead of
> scanning only the first 20mm...
> But if I use
> scanimage --mode Color -t 2 > scan.pnm
> (or any other value for -t greater than 1), it works fine - strange...
> Is this a problem with my scanner, or is it a problem with scanimage?
> And how do I tell applications to use this parameter (for example xsane
> or kooka)?
> Michael.


	I believe this is because start position detection fails, giving some zero 
value which is decreased by start offset, giving a negative value. When the 
scan starts, the scanner gets a negative location, and the scanning head 
moves wrongly. By adding a start offset, the value gets positive again and 
everything goes right.
	To fix origin detection (and get sure this is the real bug), I need the log 
file and all the pnm files (search_position.pnm and search_position16.pnm) 
created by doing:
scanimage --mode Color -t 2 >scan.pnm  2>debug.log

	Doing this with the CVS version would be the best.


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