Then sounds good news! I'll commit that into CVS promptly
Could you send sample images scans, 1 at 2400 dpi and 1 at 4800 dpi, to see what is the issue at these resolutions, and if a solution can be brought simply ? So looks like MP8x0 and MP9x0 series probably share the same CCD sensor (as plane shifting is the same), but the the shift is opposite between those 2 series, maybe because the sensor is placed opposite on MP8x0 series due to the ADF. Does MP810 sensor scans the page from left to right ? Nicolas Le samedi 30 ao?t 2008 ? 19:20 +0200, Arne a ?crit : > Hi Nicolas, > > thanks for your help. > I have tried tried the value change to 50 as you suggest and I have noticed > the following changes (normal glass scan, I have never tried using the > film scan unit): > > 75dpi: > before: OK now: color plane shift > > 150+300+600+1200dpi: > before: color plane shift now: OK! > > 2400+4800dpi: > before: color plane shift now: vertical fringed and aspect ratio not > correct > > This is already much better as the most important resolutions (150-1200dpi) > are working fine now. > At the moment I don't have time for further testing, I will send you later > tonight or tomorrow more details and some sample scans so maybe we can fix > the remaining problems (75dpi and 2400+4800dpi) too. > > Best regards, > Arne > > > On Sat, 30 Aug 2008, Nicolas wrote: > > > Hi, > > > > I've added a while back some code to the pixma backend to deal with CCD > > color planes shifts, and it currently works fine with MP970. > > > > For MP800, 810, it was based on some info I've got on bug reports (for > > instance bug #310463), but this code has not yet been tuned, especially > > the amount of shifting to apply. > > This should not be a big deal to fix now. > > > > Could you first confirm that you get the same result with ADF and with > > glass scans ? > > > > Then, you could do some tries by changing the amount of shifting applied > > by the backend: > > > > In backend directory of the latest CVS version, in file pixma_mp150.c > > > > Could you change line 980 from: > > > > mp->lines_shift = s->param->ydpi / 100; > > > > to > > > > mp->lines_shift = s->param->ydpi / 50; > > > > Recompile, and see how the amount of lines shifting changed ? > > > > Nicolas > > > > Le jeudi 28 ao?t 2008 ? 17:41 -0700, tux99 a ?crit : > > > > > > > > > Jean-Nicolas Gautier wrote: > > > > > > > > Hello, > > > > I bought a pixma MP810 one year ago. It works but I have the problem > > > > with color alignment : yellow, magenta and cyan layers are shifted. > > > > > > > > > > I have the exact same problem also with a Canon Pixma MP810. > > > I'm using Mandriva 2008.1 but I have installed the latest CVS > > > sane backend (sane-scm-2008-08-28). > > > # scanimage -V > > > scanimage (sane-backends) 1.1.0-cvs; backend version 1.1.0 > > > > > > I'm available for testing any bugfixes or for any further details, too. > > > > > > Arne > > > -- > > > View this message in context: > > > http://www.nabble.com/pixma-MP810-working-with-sane-tp19031727p19211863.html > > > Sent from the SANE - Dev mailing list archive at Nabble.com. > > > > > > > > > >
