[digikam] [Bug 467675] digiKam fail to export to WEBP and WBMP formats

[Geoff King]

https://bugs.kde.org/show_bug.cgi?id=467675

--- Comment #14 from Geoff King <gsking1 at gmail.com> ---
Created attachment 157614
  --> https://bugs.kde.org/attachment.cgi?id=157614&action=edit
_test0 image

I am sharing the files from my tests and some new observations below. 
This is on digiKam-8.0.0-20230326T082403-MacOS-x86-64-debug.pkg with MacBook
Pro Intel.
-new issue noticed - metadata not being carried over to exported files,
including comments and gps on Mac, I also tried on Ubuntu and the metadata does
carry over.  
-new issue noticed - linux appimage doesn't include g'mic.  
-sorry forgot to capture the debug log

_test0.jpg - original source use for all tests, opened in Image editor, and
exported to the formats below.
_test1.webp - no edits to original, just export as webp lossless, seems okay
except no metadata or coordinates
_test2.webp - no edits to original, just export as webp quality 65, no edits to
original file, seems okay except no metadata or coordinates
_test3.wbmp - no edits to original, just export as wbmp -  corrupt, but 1.3 MB
_test4.jp2 - edited in gmic with black and white filter before exporting,
jpeg2000, no metadata carried over, but otherwise looks okay, 
_test5.webp - edited in gmic with black and white filter before exporting,
small file created, image is missing, and shows transparent checkerboard
pattern thumbnail
_test6.jpg, edited in gmic with black and white filter before exporting,
missing gps metadata, other metadata is present

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