[digikam] [Bug 467675] digiKam fail to export to WEBP format.

[Geoff King]

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

--- Comment #37 from Geoff King <gsking1 at gmail.com> ---
(In reply to caulier.gilles from comment #32)
> Geoff,
> 
> Here you can find the AppImage demo loading a JPEG, editing with GMIC-Qt/B&W
> and exporting to WEBP. As you can see all work as expected and metadata are
> there...
> 
> https://drive.google.com/file/d/18VxKzFfXsC02-euPluy1XmemknNfbmr_/
> view?usp=sharing
> 
> I reproduced the same under MacOS without problem...
> 
Hi Gilles, 

Here is a screencast of MacOS and Digikam 8.0.0 (3/30/2023) editing in GMIC
filter and exporting to WEBP.  The resulting thumbnail shows an image, but
nothing in preview or editor.  This affects WEBP and I have had no issues with
other formats like PNG or JPEG or other built-in digikam effects.  This also
looks to affect Windows, but not Linux.  I just picked a random photo, it
happens to all (several) that I've tried.  

https://drive.google.com/file/d/1XuLik9J9X8WRuk8Xa761NdWVhAVmRogv/view?usp=share_link

I also did another test where I used exiftool to remove all metadata from the
WEBP version and then the thumbnail turned transparent.  

Regards, Geoff

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