[Digikam-users] exiv2 and metadata for png

[Gilles Caulier]

2009/4/2 Dick Angus <RJA-Linux at shaw.ca>:
> am running Kubuntu 8.10, KDE 4.2.1, Digikam 0.10.0 (from Kubuntu
> repositories), and exiv2 0.16 (from Kubuntu repositories). My photos are
> stored in png format. Many photos have comments, tags, and such in the
> database. I try to use the Album -> synchronize function and nothing appears
> to happen. The metadata display on the right hand sidebar is blank. I try to
> use the image -> metadata -> functions and everything comes up as read-only.
> Have I got something set wrong or do I need to get version 0.18 of the exiv2
> software? From my research I thought exiv2 handled metadata edit for png
> from 0.16 or greater?
>
>
> Here is the output from exiv2 -v image.png in a terminal for one of the
> images:
> File 1/1: Mike-0043.png
> File name : Mike-0043.png
> File size : 2931006 Bytes
> MIME type : image/png
> Image size : 1200 x 1800
> Mike-0043.png: No Exif data found in the file
>
>
> I thought the album -> synchronize function would copy the data; comments,
> tags, and such, from the database into the exif/iptc/xmp data of the photo
> file. I also looked at the iptc and xmp and it is read-only as well. The
> metadata -> edit caption option does show the caption in edit mode. I must
> have really misunderstood something about the metadata and how to use it?
>

To edit PNG metadata, you need

1/ Exiv2 >= 0.18

2/ libkexiv2 provided by KDE 4.2.2 (released today) where a bug have
been fixed to be able to edit this metadata.

Best

Gilles Caulier