DNG-RAW to jpeg conversion artifacts

Hi,

I recently bought a Samsung GX-10 DSLR camera which does
support the DNG
(Adobe) RAW format. I have digikam 0.9.1 installed on Fedora
7.

At the weekend I played (the first time) around with
digikam. When I tried to
convert some DNG images to jpeg I faced the following
problem: on the
right side of the picture appeared a broad bar with green
lines.
Furthermore there is a black frame around a part of the
picture. So my first guess
is that the converter takes in more pixels then it should.

Is this a bug or have I just overseen an option?

I am not sure if it is possible to attach files anyway so
you can have a look at the full sized picture here:

http://www.flickr.com/photos/stefan_grosse/529710460/

Neither Irfanview nor DIGIMAX RAW converter nor gimp/ufraw
showed this
ugly green lines on the right of the black border at the
lower and the right corner of the picture after conversion
...

Stefan

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Stefan,

if you want, you can send me your DNG file off-list
(or put it somewhere where I could fetch it) and
I will have a quick try how current svn behaves.

Arnd


On Tue, 5 Jun 2007, Gilles Caulier wrote:

> It sound like a bug in dcraw witch is used by digiKam
to process RAW
> pictures.
>
> In digiKam 0.9.1, dcraw 8.41 is used.
> In digiKam 0.9.2, dcraw 8.60 is used. Perhaps this
problem have been solved.
>
> At least, you can try to use the last dcraw command
line version (8.71) to
> check indeep.
>
> Gilles Caulier
>
> 2007/6/5, Stefan Grosse <singularitaetgmx.net>:
> >
> > Hi,
> >
> > I recently bought a Samsung GX-10 DSLR camera
which does support the DNG
> > (Adobe) RAW format. I have digikam 0.9.1 installed
on Fedora 7.
> >
> > At the weekend I played (the first time) around
with digikam. When I tried
> > to
> > convert some DNG images to jpeg I faced the
following problem: on the
> > right side of the picture appeared a broad bar
with green lines.
> > Furthermore there is a black frame around a part
of the picture. So my
> > first guess
> > is that the converter takes in more pixels then it
should.
> >
> > Is this a bug or have I just overseen an option?
> >
> > I am not sure if it is possible to attach files
anyway so you can have a
> > look at the full sized picture here:
> >
> > http://www.flickr.com/photos/stefan_grosse/529710460/
> >
> > Neither Irfanview nor DIGIMAX RAW converter nor
gimp/ufraw showed this
> > ugly green lines on the right of the black border
at the lower and the
> > right corner of the picture after conversion ...
> >
> > Stefan
> >
> > _______________________________________________
> > Digikam-users mailing list
> > Digikam-userskde.org
> > h
ttps://mail.kde.org/mailman/listinfo/digikam-users
> >
>
_______________________________________________
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Digikam-userskde.org
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ttps://mail.kde.org/mailman/listinfo/digikam-users

OK I uploaded it on:

http://www.uni-erfurt.de/mikrooekonomie/downloads/
SG100028.DNG

Its a 16 MB file.

Just tell me if the download does not work.

Stefan


-------- Original Message  --------
Subject: Re:[Digikam-users] DNG-RAW to jpeg conversion
artifacts
From: Gilles Caulier <caulier.gillesgmail.com>
To: digiKam - Digital Photo Management for the masses
<digikam-userskde.org>
Date: 05.06.2007 13:02
> I'm interesed by the DNG file too for my personal RAW
collection. Please
> share it on the web. Thanks in advance
>
> Gilles
>
> 2007/6/5, Arnd Baecker <arnd.baeckerweb.de>:
>>
>> Stefan,
>>
>> if you want, you can send me your DNG file
off-list
>> (or put it somewhere where I could fetch it) and
>> I will have a quick try how current svn behaves.
>>
>> Arnd
>>
>>
>> On Tue, 5 Jun 2007, Gilles Caulier wrote:
>>
>> > It sound like a bug in dcraw witch is used by
digiKam to process RAW
>> > pictures.
>> >
>> > In digiKam 0.9.1, dcraw 8.41 is used.
>> > In digiKam 0.9.2, dcraw 8.60 is used. Perhaps
this problem have been
>> solved.
>> >
>> > At least, you can try to use the last dcraw
command line version
>> (8.71)
>> to
>> > check indeep.
>> >
>> > Gilles Caulier
>> >
>> > 2007/6/5, Stefan Grosse <singularitaetgmx.net>:
>> > >
>> > > Hi,
>> > >
>> > > I recently bought a Samsung GX-10 DSLR
camera which does support the
>> DNG
>> > > (Adobe) RAW format. I have digikam 0.9.1
installed on Fedora 7.
>> > >
>> > > At the weekend I played (the first time)
around with digikam. When I
>> tried
>> > > to
>> > > convert some DNG images to jpeg I faced
the following problem: on
>> the
>> > > right side of the picture appeared a
broad bar with green lines.
>> > > Furthermore there is a black frame around
a part of the picture.
>> So my
>> > > first guess
>> > > is that the converter takes in more
pixels then it should.
>> > >
>> > > Is this a bug or have I just overseen an
option?
>> > >
>> > > I am not sure if it is possible to attach
files anyway so you can
>> have
>> a
>> > > look at the full sized picture here:
>> > >
>> > > http://www.flickr.com/photos/stefan_grosse/529710460/
>> > >
>> > > Neither Irfanview nor DIGIMAX RAW
converter nor gimp/ufraw showed
>> this
>> > > ugly green lines on the right of the
black border at the lower
>> and the
>> > > right corner of the picture after
conversion ...
>> > >
>> > > Stefan
>> > >
>> > >
_______________________________________________
>> > > Digikam-users mailing list
>> > > Digikam-userskde.org
>> > > h
ttps://mail.kde.org/mailman/listinfo/digikam-users
>> > >
>> >
>> _______________________________________________
>> Digikam-users mailing list
>> Digikam-userskde.org
>> h
ttps://mail.kde.org/mailman/listinfo/digikam-users
>>
>
>
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Thanks Stefan,

download worked fine and I also observe the problem you
describe
with current svn.

The picture dimensions are 3936 x 2624,
so with the following I think your suspicion is right:

According to
http://www.amazon.co.uk/Samsung-GX10-Digit
al-18-55mm-Kit/dp/B000LVFW1K
The resolution should be: 3872 x 2592

This might be the difference between total
pixels and effective pixels (10.75 vs. 10.2),

http://www.sa
msungcamera.co.uk/product/pro_view.asp?prol_uid=1925&cat
_uid=62&tabmenu=2#tabs

Which dcraw is used by the gimp/ufraw combo you used?

Best, Arnd

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Digikam-userskde.org
h
ttps://mail.kde.org/mailman/listinfo/digikam-users

Ok, thanks for the response and verification.

The (clean) ufraw conversion I did was with ufraw 0.11 (for
windows).
The homepage states that it uses dcraw 8.72

Stefan

-------- Original Message  --------
Subject: Re:[Digikam-users] DNG-RAW to jpeg conversion
artifacts
From: Arnd Baecker <arnd.baeckerweb.de>
To: digiKam - Digital Photo Management for the masses
<digikam-userskde.org>
Date: 05.06.2007 13:50
> Thanks Stefan,
>
> download worked fine and I also observe the problem you
describe
> with current svn.
>
> The picture dimensions are 3936 x 2624,
> so with the following I think your suspicion is right:
>
> According to
> http://www.amazon.co.uk/Samsung-GX10-Digit
al-18-55mm-Kit/dp/B000LVFW1K
> The resolution should be: 3872 x 2592
>
> This might be the difference between total
> pixels and effective pixels (10.75 vs. 10.2),
>
> http://www.sa
msungcamera.co.uk/product/pro_view.asp?prol_uid=1925&cat
_uid=62&tabmenu=2#tabs
>
> Which dcraw is used by the gimp/ufraw combo you used?
>
> Best, Arnd
>
> _______________________________________________
> Digikam-users mailing list
> Digikam-userskde.org
> h
ttps://mail.kde.org/mailman/listinfo/digikam-users
>
>
>   


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Gilles, so to support Pentax K10D and Samsung GX10
properly,
it seems that an update of dcraw to 8.72 would be needed
...

On Tue, 5 Jun 2007, Stefan Grosse wrote:

> Ok, thanks for the response and verification.
>
> The (clean) ufraw conversion I did was with ufraw 0.11
(for windows).
> The homepage states that it uses dcraw 8.72

P.S.:

[...]

> > The picture dimensions are 3936 x 2624,
> > so with the following I think your suspicion is
right:
> >
> > According to
> > http://www.amazon.co.uk/Samsung-GX10-Digit
al-18-55mm-Kit/dp/B000LVFW1K
> > The resolution should be: 3872 x 2592

dcraw 8.72 contains the interesting lines in the source:

if (height == 2624 && width == 3936) { /* Pentax
K10D and Samsung GX10 */
    height = 2616;
    width  = 3896;
  }
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On Tue, 5 Jun 2007, Gilles Caulier wrote:

> This is want mean than we need to update dcraw.c in
libkdcraw to 8.72version.
>
> I'm currently port libkdcraw code to QT4/KDE4. So, to
perform advanced test
> with this library using new dcraw.c in core, we need to
do it after than
> digiKam will be ported to QT4/KDE4...

>From your mails I know that updating dcraw is a pain
due to incompatible changes in the command line options,
but
if an update is only done for the QT4/KDE4 branch, many
users with their new K10D and Samsung will not be able
to use digikam for more than a year (?) , or even longer,
(depending on how quickly their distribution will move to
KDE4...)

Just my 2 Cents (I have an older Canon and no problems 

Arnd
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