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

[Geoff King]

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

--- Comment #29 from Geoff King <gsking1 at gmail.com> ---
(In reply to caulier.gilles from comment #24)
> New test, with test01.jpg open in editor, edited with gmic/B&W, and exported
> to webp, jp2, and wbmp.
> 
> All is fine expected for wbmp which is broken due to a bug in KImageFormats
> codecs.
> 
> https://i.imgur.com/Jsd8Gp9.png
> 
> Exif, makernotes, and XMP are here for webp, jp2. The original JPEG file do
> not have any GPS data, so...
> 
> Gilles

For me there is definitely something wrong with using gmic and exporting to
WEBP on MacOS.  
I have tried several times (GMIC black & white filter and others) and it gives
a transparent file exporting to WEBP. 

I also tried this on Windows and it gave similar results (one quick test).  

I looked at Ubuntu also, and it doesn't have the gmic plugin in the appimage.  

If I use the same source file, process using the digikam built in black and
white module, then export, it works fine. 

When exporting to WEBP with or without editing, I lose the EXIF data.
I tried several files with same results so don't think is my files.  
most webp export tests at quality 73

Thanks, Geoff

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