[Digikam-devel] [Bug 142056] Save changes of image modifications with Versioning.

[Gilles Caulier]

https://bugs.kde.org/show_bug.cgi?id=142056





--- Comment #40 from Gilles Caulier <caulier gilles gmail com>  2009-06-09 21:12:19 ---
>> That is why Gilles declared that png is better, and png seems to be the most
>> likely candidate, not jpg.

>Can the Exif/IPTC/XMP metadata be maintained in the PNG?

Yes definitively.

To convince you try this way :

#convert foo.jpg foo.png     (where foo.jpg has Exif/iptc/xmp)
#convert foo.png foo2.jpg

and look with Exiftool or Exiv2 in foo2.jpg. All still there

You can do the same to check foo.png.

in digiKam and Exiv2 i have implemented full support of PNG metadata. It's
better than tiff because all metadata are stored in a dedicated place. Iunlike
tiff, we don't mix Exif image informations with all Exif photo informations.

In PNG whole Exif byte arry is stored in a dedicated chunk. Same for IPTC, and
XMP. There is not confusion possible as with TIFF. TIFF is really a mess...
This is why it not fully supported properly in all photo software.

Gilles Caulier

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