exiv2 and metadata for png

[Dick Angus-4]

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?


An old mainframer getting current

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[Gilles Caulier-4]

2009/4/2 Dick Angus <[hidden email]>:

> 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
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[Dick Angus-4]

On Thursday 02 April 2009 10:24:09 am Gilles Caulier wrote:
> 2009/4/2 Dick Angus <[hidden email]>:
> > 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
> _______________________________________________
> Digikam-users mailing list
> [hidden email]
> https://mail.kde.org/mailman/listinfo/digikam-users

Thanks for the quick response Gilles. I'll get exiv2 0.18 as soon as Kubuntu posts it to the repository.

An old mainframer getting current

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