Wrong colour scanning with HP 7400c

Hi,

On Sunday 23 April 2006 13:02, Erik P. Olsen wrote:

> > Aside the stripe the image is completely fine?
Does it only happen when
> > you scan the whole page? E.g. is due to some
plastic on the side and the
> > other software just allow scanning a smaller
region? Or does it happen
> > for scans in the middle of the page as well?
>
> It does not happen with a smaller region. However, I
can reduce the scan by
> so small an amount that the yellow stripe will still
show up just smaller.
> But I can also see that the yellow stripe overlays the
picture, so it is
> not some plastic on the side or similar, it is actually
induced by the
> backend.
>
> BTW, there is also a tiny green stripe about 1/5 of the
width of the yellow
> stripe.

Hm, maybe then something is or got wrong for the 7400
calibration.

Yours,

-- 
René Rebe - Rubensstr. 64 - 12157 Berlin (Europe / Germany)
            http://exactcode.de | http://t2-project.org | http://rebe.name
            +49 (0)30 / 255 897 45

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Rene Rebe wrote:
> Hi,
> 
> On Sunday 23 April 2006 13:02, Erik P. Olsen wrote:
> 
>>> Aside the stripe the image is completely fine?
Does it only happen when
>>> you scan the whole page? E.g. is due to some
plastic on the side and the
>>> other software just allow scanning a smaller
region? Or does it happen
>>> for scans in the middle of the page as well?
>> It does not happen with a smaller region. However,
I can reduce the scan by
>> so small an amount that the yellow stripe will
still show up just smaller.
>> But I can also see that the yellow stripe overlays
the picture, so it is
>> not some plastic on the side or similar, it is
actually induced by the
>> backend.
>>
>> BTW, there is also a tiny green stripe about 1/5 of
the width of the yellow
>> stripe.
> 
> Hm, maybe then something is or got wrong for the 7400
calibration.

Anything I can do for the calibration?

-- 
Regards,
Erik P. Olsen.


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Hi,

On Sunday 23 April 2006 23:28, Erik P. Olsen wrote:

> > On Sunday 23 April 2006 13:02, Erik P. Olsen
wrote:
> >>> Aside the stripe the image is completely
fine? Does it only happen when
> >>> you scan the whole page? E.g. is due to
some plastic on the side and
> >>> the other software just allow scanning a
smaller region? Or does it
> >>> happen for scans in the middle of the page
as well?
> >>
> >> It does not happen with a smaller region.
However, I can reduce the scan
> >> by so small an amount that the yellow stripe
will still show up just
> >> smaller. But I can also see that the yellow
stripe overlays the picture,
> >> so it is not some plastic on the side or
similar, it is actually induced
> >> by the backend.
> >>
> >> BTW, there is also a tiny green stripe about
1/5 of the width of the
> >> yellow stripe.
> >
> > Hm, maybe then something is or got wrong for the
7400 calibration.
>
> Anything I can do for the calibration?

The calibration is done (for scanners requiring this) by the
avision driver.
Most probably some regression (e.g. support for other
calibration data
layout) was introduced since I know it noce works perfectly
for the HP 7400.

You can either try older versions and tell me which one
work, read the
svn history like svn log http://svn
.exactcode.de/sane-avision/trunk or
the code directory to find out where it goes wrong. I'll
take a look in some
days when the important stuff from my desk is done.

Yours,

-- 
René Rebe - Rubensstr. 64 - 12157 Berlin (Europe / Germany)
            http://exactcode.de | http://t2-project.org | http://rebe.name
            +49 (0)30 / 255 897 45

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Rene Rebe wrote:
> Hi,
> 
> On Sunday 23 April 2006 23:28, Erik P. Olsen wrote:
> 
>>> On Sunday 23 April 2006 13:02, Erik P. Olsen
wrote:
>>>>> Aside the stripe the image is
completely fine? Does it only happen when
>>>>> you scan the whole page? E.g. is due to
some plastic on the side and
>>>>> the other software just allow scanning
a smaller region? Or does it
>>>>> happen for scans in the middle of the
page as well?
>>>> It does not happen with a smaller region.
However, I can reduce the scan
>>>> by so small an amount that the yellow
stripe will still show up just
>>>> smaller. But I can also see that the yellow
stripe overlays the picture,
>>>> so it is not some plastic on the side or
similar, it is actually induced
>>>> by the backend.
>>>>
>>>> BTW, there is also a tiny green stripe
about 1/5 of the width of the
>>>> yellow stripe.
>>> Hm, maybe then something is or got wrong for
the 7400 calibration.
>> Anything I can do for the calibration?
> 
> The calibration is done (for scanners requiring this)
by the avision driver.
> Most probably some regression (e.g. support for other
calibration data
> layout) was introduced since I know it noce works
perfectly for the HP 7400.
> 
> You can either try older versions and tell me which one
work, read the
> svn history like svn log http://svn
.exactcode.de/sane-avision/trunk or
> the code directory to find out where it goes wrong.
I'll take a look in some
> days when the important stuff from my desk is done.

Where can I find the older versions?

-- 
Regards,
Erik P. Olsen.


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Hi,

On Wednesday 26 April 2006 18:06, Erik P. Olsen wrote:

> >>>> BTW, there is also a tiny green stripe
about 1/5 of the width of the
> >>>> yellow stripe.
> >>> Hm, maybe then something is or got wrong
for the 7400 calibration.
> >> Anything I can do for the calibration?
> > 
> > The calibration is done (for scanners requiring
this) by the avision driver.
> > Most probably some regression (e.g. support for
other calibration data
> > layout) was introduced since I know it noce works
perfectly for the HP 7400.
> > 
> > You can either try older versions and tell me
which one work, read the
> > svn history like svn log http://svn
.exactcode.de/sane-avision/trunk or
> > the code directory to find out where it goes
wrong. I'll take a look in some
> > days when the important stuff from my desk is
done.
> 
> Where can I find the older versions?

Aside the release versions on the SANE homepage, a very
detailed history
can be accessed in my SVN repository:

svn log http://svn
.exactcode.de/sane-avision/trunk

svn co -r $revision ...

Will give you the old revision, or svn up -r $rev when you
have a checkout.

Yours,

-- 
René Rebe - Rubensstr. 64 - 12157 Berlin (Europe / Germany)
            http://www.exactcode.de |
http://www.t2-project.org
            +49 (0)30  255 897 45

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