[sane-devel] pixma MP810 working with sane

[Nicolas]

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 août 2008 à 17:41 -0700, tux99 a écrit :
> 
> 
> 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
> -- 
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> 
>