[sane-devel] avision backend support of HP 8250

René Rebe rene at exactcode.de
Fri Jan 27 06:49:12 UTC 2006


On Friday 27 January 2006 03:49, Hans Brand (sent by Nabble.com) wrote:

> I am very interrested in getting the 8200/8250/8290 to work in DPIs higher
> than 1200 dpi. I've narrowed the problem so far that scans seem to work up
> to 1270 but fail at 1275 and higher.

Best scan something high as 2400 and compare the window descriptor sent. It 
also is possible that thw Windows driver maxes out at 1200 and interpolates 
the rest ...

> I managed to get USB snoops from the original HP drivers doing scans at
> 1270 and 1275 dpi and I am now trying to find the significant differences
> between these snoops and then I want to compare these with the debug logs
> from the avision back-end.
> However, until now the only documentation I can use are the sane-backend
> sources. What would help is some documentation about the avision (USB)
> protocols. Is there any info available?

I have SPECS from Avision I'm not allowed to hand them to 3rd parties. However 
the avision.c code should be easy to understand.


René Rebe - Rubensstr. 64 - 12157 Berlin (Europe / Germany)
            http://www.exactcode.de | http://www.t2-project.org
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