Antti Andreimann wrote: > > 1. all scanning modes except 16bit ones work (both 16bit modes: color > and grey crash the scanner). > 2. DPIs higher than 1200 (this scanner supports up to 4800) fail > (scanner crashes). > > I'm not sure if I'm supposed to be able to scan something that's not a > slide or negative with a higher DPI than 1200, I'll double check it > tommorrow. >
Hello 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. 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? Regards, Hans -- View this message in context: http://www.nabble.com/avision-backend-support-of-HP-8250-t739998.html#a2612273 Sent from the SANE - Dev forum at Nabble.com. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20060126/a08b654a/attachment.html From [email protected] Fri Jan 27 06:49:12 2006 From: [email protected] (=?utf-8?q?Ren=C3=A9_Rebe?=) Date: Fri Jan 27 07:24:22 2006 Subject: [sane-devel] avision backend support of HP 8250 In-Reply-To: <[email protected]> References: <[email protected]> <[email protected]> <[email protected]> Message-ID: <[email protected]> Hi, 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. Yours, -- Ren? Rebe - Rubensstr. 64 - 12157 Berlin (Europe / Germany) http://www.exactcode.de | http://www.t2-project.org +49 (0)30 255 897 45
