... And will add a little change for 75dpi, to not apply any shift, exactly as for MP970
Le samedi 30 ao?t 2008 ? 23:34 +0200, Nicolas a ?crit : > 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. > > > > > > > > > > > > > >
