https://bugs.kde.org/show_bug.cgi?id=408005

            Bug ID: 408005
           Summary: gwenview does not open (all) GeoTIFFs
           Product: gwenview
           Version: 18.04.0
          Platform: Debian unstable
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: gwenview-bugs-n...@kde.org
          Reporter: mdi...@grulic.org.ar
  Target Milestone: ---

SUMMARY
When openeng certain (most, but not all) GeoTIFF files, gwenview presents this 
message:

Loading ‘000x004-hillshade.tif’ failed
Loading meta information failed.

On the console I see this:

QImageReader::read() using format hint "tif" failed: "Unknown error"
QImageReader::read() without format hint failed: "Unsupported image format"
QImageReader::read() using format hint "tif" failed: "Unknown error"
QImageReader::read() without format hint failed: "Unsupported image format"
QImageReader::read() using format hint "tif" failed: "Unknown error"
QImageReader::read() without format hint failed: "Unsupported image format"

I used ldd and strace to guess that libtiff is being used, but libtiff does
definitely support GeoTIFF, as it is used by gdal, whi can read and write such
files (and gdal's author, Even Rouault, also commits to libtiff (yes, it's all
circunstancial, but I think it makes sense).

I would provide a example file, but it weights 9MiB+, and I'm not sure I should
attach it or not. Let me know if it's OK.

Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 5.54.0
Qt Version: 5.11.3

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