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

[Guenther M. Erhard via KDE Bugzilla]

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: digikam-devel at kde.org
          Reporter: guenther-digikam at erhard.mobi

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@gmx.de

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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