[Digikam-users] Comments in png files

[Paweł Marciniak]

Paweł Marciniak wrote:

> Thank you Gilles for replying!
> 
> Gilles Caulier wrote:
>> Exiv2 do not support yet PNG metadata for writting. Patch still
>> uncomplete on my computer.
>> [...]
>> yes, Caption, date, rating, and tags are store in digiKam database.
> 
> I see. Is there a way (it may even involve some hacking) to retrieve the
> captions from db and embed them in jpeg files? Otherwise it's A LOT of
> rewriting for me :(
> 
>>> When converting manually with convert, no error is raised, but when I
>>> try to
>>> view the converted image in digiKam, no metadata is shown at all.
>> 
>> Exif and iptc ??? Impossible (:=))). All my photo collection are in PNG
>> (taken originally from JPEG or RAW), and metadata still present of
>> course.
>> 
>> Witch camera you use ? Can you send me a JPEG file taken with your camera
>> to test. How are you converted your JPEG files to PNG ? Using Camera
>> interface during download ?
> 
> Yes, there's nothing after opening the photo in digiKam (display(1),
> however, sees exif metadata in the jpeg, but not iptc). I found out that
> the digiKam console says:
> 
> 8<-------------------------------------
> Warning: IPTC dataset Iptc.Application2.Preview has invalid size 67904;
> skipped.
> Cannot load metadata using Exiv2  (Failed to decode IPTC metadata)
> 8<-------------------------------------
> 
> It looks like ImageMagick issue, but the png may be misformated as well.
> The interesting thing is that ImageMagick doesn't complain during
> conversion, and upgrading it to the latest version (6.3.6-7) didn't solve
> the problem. I uploaded an example (both the orginal photo and convert(1)
> output) to http://pandora.cs.put.poznan.pl/~pmarciniak/digikam/ photo name
> marineland-021.{jpg,png} - feel free to inspect it. All my photos were
> taken with Canon S2 IS and converted to png during download.
> 
> During downloading and commenting my photo collection I was using svn
> version of digiKam, recently I reverted to binary package (0.9.3-beta1),
> but I guess that should not be a problem, since it is still newer than my
> last svn build.
> 
> I also uploaded to the mentioned location another example, marineland-001
> {jpg,png}, where the jpeg's exif metadata is shown correctly by digiKam,
> but not iptc, and the console says:
> 
> 8<-------------------------------------
> Warning: IPTC dataset Iptc.Application2.Preview has invalid size 67818;
> skipped.
> Warning: IPTC dataset Iptc.0x00ce.0x0056 has invalid size 10114; skipped.
> Warning: IPTC dataset Iptc.Application2.Preview has invalid size 67818;
> skipped.
> Warning: IPTC dataset Iptc.0x00ce.0x0056 has invalid size 10114; skipped.
> 8<-------------------------------------
> 
> Pawel

Hello,

I still haven't solved my problem :( The png files in question are have been
created and touched only by digiKam, no other program.
Is anyone able to help?

Thanks,
Pawel