[digikam] [Bug 368862] New: Thumbnails for Olympus raw (ORF) in albumview are blurred

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https://bugs.kde.org/show_bug.cgi?id=368862

            Bug ID: 368862
           Summary: Thumbnails for Olympus raw (ORF) in albumview are
                    blurred
           Product: digikam
           Version: 4.12.0
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: AlbumsView
          Assignee: [hidden email]
          Reporter: [hidden email]

I have a strange problem after upgrading to Ubuntu 16.04: The album view shows
for Panasonic raw files (rw2) the preview thumbnail perfectly sharp, but for
Olympus raw (orf) they are blurred.

Problem is independent of digikam version: digikam 4.1x or digikam 5.1 does not
matter.



Reproducible: Always

Steps to Reproduce:
I have a strange problem after upgrading to Ubuntu 16.04: The album view shows
for Panasonic raw files (rw2) the preview thumbnail perfectly sharp, but for
Olympus raw (orf) they are blurred. The effect is independent of the scale
size: 128 to 512 px does not matter.

Also the effect can be reproduced in digikam versions 4.12, 4.13, 4.14 and 5.1.
I've installed all to check and there is no difference.

Next I've checked it on a freshly installed system. After a standard install I
have only added digikam 4.12 from the original 16.04 repos. Same effect: orf
blurred and rw2 are sharp.

Next I checked it in nautilus: orf thumbnails are sharp. Same in darktable.

Changing the option from automatic to "embedded picture" or "half raw size" has
no influence.

So I guess it must be a problem inside digikam.

Actual Results:  
Olympus orf thumbnails are blurred.
Screenshot and sample files see:
https://cloud.gmx.net/ngcloud/external?guestToken=IIaKtrn9RvGsY3IGwMMumQ&loginName=guenther.erhard@...

Expected Results:  
Sharp raw thumbnails are they are shown for Panasonic rw2.

digiKam version 4.12.0
Exiv2 kann in JP2 speichern: Ja
Exiv2 kann in JPEG speichern: Ja
Exiv2 kann in PGF speichern: Ja
Exiv2 kann in PNG speichern: Ja
Exiv2 kann in TIFF speichern: Ja
Exiv2 unterstützt XMP-Metadaten: Ja
LibCImg: 130
LibEigen: 3.2.92
LibExiv2: 0.25
LibJPEG: 80
LibJasper: 1.900.1
LibKDE: 4.14.16
LibKExiv2: 2.4.0
LibKdcraw: 2.4.2
LibLCMS: 2060
LibLensFun: 0.2.8-0
LibPGF: 6.14.12
LibPNG: 1.2.54
LibQt: 4.8.7
LibRaw: 0.17.0
LibTIFF: LIBTIFF, Version 4.0.6 Copyright (c) 1988-1996 Sam Leffler Copyright
(c) 1991-1996 Silicon Graphics, Inc.
Parallelisiertes Entfernen von Mosaikmustern: Unbekannt
Prozessorkerne: 2
Unterstützung für Demosaic GPL2: Unbekannt
Unterstützung für Demosaic GPL3: Unbekannt
Unterstützung für LibKGeoMap: Nein
Unterstützung für LibLqr: Ja
Unterstützung von RawSpeed-Codec: Unbekannt
Datenbanktreiber: QSQLITE
KIPI-Module: 4.12.0
LibGphoto2: 2.5.9
LibKface: 3.5.0
LibKipi: 2.2.0
LibOpenCV: 2.4.9.1
Unterstützung für Baloo: Ja
Unterstützung für Kdepimlibs: Nein
Unterstützung für Sqlite2: Ja

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--- Comment #1 from Guenther M. Erhard <[hidden email]> ---
Created attachment 101101
  --> https://bugs.kde.org/attachment.cgi?id=101101&action=edit
Screenshot of digikam album view with blurred orf thumbnail

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--- Comment #2 from [hidden email] ---
Can you share an ORF sample file to test here with digiKam 5.x ? Please use
cloud service to share file.

Gilles Caulier

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--- Comment #3 from Guenther M. Erhard <[hidden email]> ---
Hi Gilles,

I have put one sample orf, one rw2 sample and the screenshot put on GMX cloud:
https://cloud.gmx.net/ngcloud/external?guestToken=IIaKtrn9RvGsY3IGwMMumQ&loginName=guenther.erhard@...

BR
Günther

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--- Comment #4 from [hidden email] ---
No problem here with digiKam 5.2.0 :

https://www.flickr.com/photos/digikam/29078699804/in/dateposted-public/

Did you enable Color Managed View with a wrong screen color profile ?

Gilles Caulier

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Maik Qualmann <[hidden email]> changed:

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--- Comment #5 from Maik Qualmann <[hidden email]> ---
Created attachment 101110
  --> https://bugs.kde.org/attachment.cgi?id=101110&action=edit
thumbnail.png

The extracted thumbnail from ORF image with libraw has only 160x120 pixels. The
thumbnail from RW2 image has 1920x1440 pixels. Good to see at maximum thumbnail
size view.

Maik

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--- Comment #6 from Guenther M. Erhard <[hidden email]> ---
Created attachment 101112
  --> https://bugs.kde.org/attachment.cgi?id=101112&action=edit
Thumbnail extracted from ORF by dcraw

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--- Comment #7 from Guenther M. Erhard <[hidden email]> ---
Hi Gilles and Maik,

No, CMS is correctly installed and setup.

But I'm confused that libraw extracts such a small preview. If I use dcraw -x
GME15390.ORF then I got an embedded jpg with 2400x3000 which is perfectly
sharp. Maybe there is something wrong with libraw.

Just a thought: maybe the ORF raw file has several previews in different sizes
embedded and libraw pcks the first or smallest one?

Guenther

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--- Comment #8 from Guenther M. Erhard <[hidden email]> ---
One more thought: I use Digikam since version 0.8 and had never experienced
this in all versions (did regularly updates from svn). Also after it was
possible to have the thumbnails greater than 256px the pictures were always
sharp. And digikam always used the embedded previews (which were already at
1600x1200 for my old Olympus E-510 raw) and not the halfsize raw because
otherwise pictures shot in b/w would have a color thumbnail in album view.

So I guess it must be some change in libraw or a related lib.

Guenther

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--- Comment #9 from Guenther M. Erhard <[hidden email]> ---
> But I'm confused that libraw extracts such a small preview. If I use dcraw
> -x GME15390.ORF then I got an embedded jpg with 2400x3000 which is perfectly
Just saw a typo: the command is dcraw -e FILENAME

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--- Comment #10 from Maik Qualmann <[hidden email]> ---
Yes, there are 2 preview images in different sizes available:

maik@linux-tpgn:~> exiv2 -pp GME15390.ORF
Preview 1: image/jpeg, 160x120 pixels, 6946 bytes
Preview 2: image/jpeg, 3200x2400 pixels, 1004415 bytes

I have searched another RAW image from this camera on the Web. At this file
libraw used the large preview for the thumbnail. However, the firmware version
from your camera is greater. Strange.

Maik

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--- Comment #11 from Guenther M. Erhard <[hidden email]> ---
Mi Maik,

That is maybe a glue. I use the experimental feature write meta data to raw
files.
To compare it I have made a new picture and imported it into digikam and did
nothing else. But the result was the same.

To give you more files to test I have uploaded to the GMX cloud some more raw
files which all show only the small embedded preview in digikam:
E-M5_no-Meta-write.ORF -> the virgin raw file mentioned above
E-M5_old_firmware_Meta-written.ORF -> one of the first pictures I've made with
this camera. Firmware is the original one. Meta was written.
E-510_Meta-written.orf -> a file from my old E-510 camera with meta data
written
E-420_Meta-written.ORF -> a file from my wifes old E-420 camera with meta data
written

HTH
Guenther

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--- Comment #12 from Guenther M. Erhard <[hidden email]> ---
And all these files showed the correct preview with the same digikam version
(e.g. 4.13) under Ubuntu 14.04.

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--- Comment #13 from [hidden email] ---
Warning.

In digiKam core, the preview and thumbnails extraction can be processed by 2
ways for RAW files.

1/ Exiv2 API
2/ Libraw API

Depending of Exiv2 version used by digiKam the step 1/ can extract the
thumbnail instead the preview and vis versa (if i remember).

Note : raw are big data container, mostly based on TIFF/EP. one tiff tag can
store thumb, one others can store more than one preview images in different
sizes. In fact RAW are big mess, and sometime this can give strange behavior.

Gilles Caulier

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--- Comment #14 from Guenther M. Erhard <[hidden email]> ---
In my opinion the problem is the libraw version. Exiv2 is the same version
(0.25) on both Ubuntu 14.04 and 16.04.

I have now installed libraw 0.16.2 instead of 0.17.1 in my Ubuntu 16.04 and
recompiled digikam 4.13 for a test and it is working! After thumbnails
recreating they are sharp. So something has changed in libraw 0.17.

Guenther

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--- Comment #15 from [hidden email] ---
Are you sure that problem is not fixed with digiKam 5.1.0 which include libraw
0.18 ?

If no, please report this problem to Libraw team, through github project page.

https://github.com/LibRaw/LibRaw/issues

Gilles Caulier

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--- Comment #16 from Guenther M. Erhard <[hidden email]> ---
Just compiled 5.3 from git with libraw 0.18 and the error is the same. So it is
libraw.
I'll report to the libraw team.

Thanks,
Guenther

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--- Comment #17 from Guenther M. Erhard <[hidden email]> ---
The libraw team has tested it and thinks that libraw is o.k.:
https://github.com/LibRaw/LibRaw/issues/77

So what is broken?

Guenther

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--- Comment #18 from [hidden email] ---
With digiKam 5.2.0, there is no problem here to preview your ORF with good
quality :

https://www.flickr.com/photos/digikam/29717186702/in/dateposted-public/

Check your Preview settings, as mine.

Gilles Caulier

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--- Comment #19 from Maik Qualmann <[hidden email]> ---
Gilles,

previewe is ok, only the thumbnail. Use maximum thumbnail size.

Maik

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