Discussion:
[digikam] [Bug 397177] New: image editor does not export exif and IPTC data when saving to PNG
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yves bodson
2018-08-05 11:43:25 UTC
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https://bugs.kde.org/show_bug.cgi?id=397177

Bug ID: 397177
Summary: image editor does not export exif and IPTC data when
saving to PNG
Product: digikam
Version: 5.6.0
Platform: Ubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: grave
Priority: NOR
Component: FilesIO-PNG
Assignee: digikam-bugs-***@kde.org
Reporter: ***@gmail.com
Target Milestone: ---

When editing RAW photos and attempting to save as PNG, EXIF and IPTC and
Metadata are not copied to PNG!
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b***@kde.org
2018-08-05 12:22:20 UTC
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https://bugs.kde.org/show_bug.cgi?id=397177

***@gmail.com changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |***@gmail.com

--- Comment #1 from ***@gmail.com ---
How did you confirm this dysfunction ? How did you test ?

Exif, IPTC, and XMP are copied as byte array in internal PNG chunk. All is
preserve, and since the first version of digiKam. I'm sure, i implemented this
feature myself and patch Exiv2 shared lib to support PNG file format.

PNG do not support metadata as Exif, Iptc, or XMP in standard, even if Adobe
write some specification about to support XMP in PNG late in PNG format life.

Before Adobe and XMP support, Open source as add the capability to support this
metadata chunk in PNG. Look ImageMagick for ex. You can convert JPEG with
metadata in PNG and convert back to JPEG without to lost these important
information.

So before to conclude and critic quickly all the work done in DK project, check
you words well...

Gilles Caulier
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b***@kde.org
2018-08-05 12:28:40 UTC
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https://bugs.kde.org/show_bug.cgi?id=397177

***@gmail.com changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WAITINGFORINFO

--- Comment #2 from ***@gmail.com ---
Also, you need to be MORE precise : WHICH RAW file format did you use ? There
are more than 800 RAW file format supported in digiKam. This is a big puzzle to
solve.

So, perhaps... with your RAW file format, your metadata extraction to backport
in PNG do not work well.

If it's the case, do not blame DK team, but ask to your camera maker to not try
to re-invent the wheel at each camera model commercialized...

In all cases, i tried to load and save a JPEG file with EXIF, Iptc, and Xmp
metadata to PNG, and all informations are preserved, as EXPECTED...

Gilles Caulier
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b***@kde.org
2018-08-10 13:23:13 UTC
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https://bugs.kde.org/show_bug.cgi?id=397177

***@gmail.com changed:

What |Removed |Added
----------------------------------------------------------------------------
Resolution|WAITINGFORINFO |FIXED
Version Fixed In| |6.0.0

--- Comment #3 from ***@gmail.com ---
No fresh feedback
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