It's been a while since I originally brought this up, but I've pulled out the ol' scanner for another go. to recap: color calibration isn't quite right on my canon lide35--the dark colors drop out to black. I turned on SCAN_FLAG_DISABLE_SHADING as you instructed, and as you predicted this recovered my lost dark colors. Where should I go from here? Should I crank up SANE_DEBUG_GENESYS and send you the scanimage output and *.pnm files?
Thanks, Luke On 3/7/06, Pierre Willenbrock <pie...@pirsoft.dnsalias.org> wrote: > > > - Color reproduction is better with the sane driver than the windows > driver, > > which tends to boost the reds way too much (yaay) > > - Brightness reproduction is quite poor with the sane driver. It seems > that > > darker colors just drop off to black very quickly. > > A better tool to determine if the bright and dark colors are correctly > reproduced is a histogram tool. You can clearly see, if there is still > room at the bottom and top of the histogram(not too much, as you still > want some useable color values ;-)). > > This reveals that dark colors are cut off for the sane driver, but it > also shows that the windows driver cuts off bright colors. > > Anyway, it shows a incorrect calibration on the sane side. <snip> > To get an unshaded image, you can disable shading correction in > gl841_init_regs_for_scan by changing the flags(last parameter to > gl841_init_scan_regs, currently 0) to include SCAN_FLAG_DISABLE_SHADING. > > If the image then still shows dark colors cut off, the offset/exposure > calibration is to blame. Otherwise the shading calibration calculates > incorrect data(which i suspect). > > I should put this lengthy description online somewhere.. > > Regards, > Pierre > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20070104/5c54d066/attachment.htm From patrick....@nerim.net Thu Jan 4 13:47:02 2007 From: patrick....@nerim.net (patrick....@nerim.net) Date: Thu Jan 4 16:02:04 2007 Subject: [sane-devel] Nikon LS9000 Message-ID: <2085.62.235.139.229.1167914822.squir...@webmail.nerim.net> Dear all I own a Nikon coolscan 9000. This model is even not in the list of the Nikon ones. Which effort is expected if I want to support this scanner? Regards
