A recent update has stopped gwenview from displaying tiff images, for example this one. I am told that "Loading ‘CCITT_1.TIF’ failed. Loading meta information failed." If I launch gwenview from the terminal with the filename as an argument, I get the following.

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Invalid pixmap specified.
QTimeLine::setDuration: cannot set duration <= 0
Invalid pixmap specified.
QTimeLine::setDuration: cannot set duration <= 0
Invalid pixmap specified.
QTimeLine::setDuration: cannot set duration <= 0
kf5.kservice.sycoca: Trying to open ksycoca from "/home/lee/.cache/ksycoca5"
Invalid pixmap specified.
QTimeLine::setDuration: cannot set duration <= 0
Shortcut for action  "rate_0" "Zero" set with QAction::setShortcut()! Use KActionCollection::setDefaultShortcut(s) instead.
Shortcut for action  "rate_1" "⋆" set with QAction::setShortcut()! Use KActionCollection::setDefaultShortcut(s) instead.
Shortcut for action  "rate_2" "⋆⋆" set with QAction::setShortcut()! Use KActionCollection::setDefaultShortcut(s) instead.
Shortcut for action  "rate_3" "⋆⋆⋆" set with QAction::setShortcut()! Use KActionCollection::setDefaultShortcut(s) instead.
Shortcut for action  "rate_4" "⋆⋆⋆⋆" set with QAction::setShortcut()! Use KActionCollection::setDefaultShortcut(s) instead.
Shortcut for action  "rate_5" "⋆⋆⋆⋆⋆" set with QAction::setShortcut()! Use KActionCollection::setDefaultShortcut(s) instead.
org.kde.kactivities.lib.core: Creating ResourceInstance: empty for now
QImageReader::read() using format hint "tif" failed: "Unsupported image format"
QImageReader::read() without format hint failed: "Unsupported image format"


I've also tried renaming the file to *.tif and *.tiff, but it still fails.

Arch Linux
The package manager says gwenview 14.12.2, but the GUI menu says Gwenview 5.0.0 pre, using KDE Frameworks 5.6.0.

is there a package called libtiff5 (or similar) available ? if so please install it

Ah, I did have libtiff5 installed, but after installing qt5-imageformats, it now works. Would you consider the somewhat uninformative error message a bug? If so I'm happy to file it.

Thanks again for your help.

==EDIT==
I just found this bug in the Arch tracker.