[Digikam-devel] [digikam] [Bug 347737] Tagged RAW files do not show tags after round trip to RawTherapee

[Gilles Caulier]

https://bugs.kde.org/show_bug.cgi?id=347737

--- Comment #23 from Gilles Caulier <caulier.gilles at gmail.com> ---
Alan,

> 1st: It has nothing to do with RawTherapee as the XMP data was written to
> the Exif section of the CR2 image by libkexiv2 via digikam. RawTherapee
> carried over that data unchanged to the JPG.

no. digiKam or libkexiv2 do not force to play directly with
Exif.Image.XMLPacket. I just grep in code to see if Exif.Image.XMLPacket is
used somewhere, and it appear only in digiKam tiff loader for image editor.
This have nothing about this entry.

Typically, digiKam as to Exiv2 (through libkexiv2) to fill Exif, IPTC and XMP.
Exiv2 must decide where tags must be handle (in this case at Exif, or Xmp
section)

The CR2 Raw file can not store XMP value to a dedicated sub container (section,
chunk) as it's do with JPEG or PNG. After all CR2 are TIFF, and there is not
size limitation as JPEG to host data.

Gilles

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