Re: [gthumb-list] Date fields in gThumb 3 comments

[Paolo Bacchilega <paolo bacchilega libero it>]

Il 14/10/2013 02:45, Rennie deGraaf ha scritto:
> On 10/13/2013 04:36 AM, Paolo Bacchilega wrote:
> > Il 13/10/2013 10:57, Rennie deGraaf ha scritto:
> > > Hello
> > >
> > > Like gThumb 2, gThumb 3 stores comment data both in an XML comment file
> > > and in IPTC tags.  In gThumb 2, the IPTC date was treated as
> > > authoritative: if the comment file was missing or the date differed, the
> > > comment file date would be replaced with the IPTC one.
> > >
> > > This seems to have changed in gThumb 3. If the comment file is missing,
> > > the date is re-created from the EXIF date, rather than the IPTC date.
> > > Further, the default behaviour in the comment/metadata dialog is to
> > > replace the date with the EXIF date, even if an IPTC date and comment
> > > date are already set.
> >
> > the date is read from the following fields, in decreasing priority order:
> >
> > Exif::Photo::DateTimeOriginal
> > Xmp::exif::DateTimeOriginal
> > Exif::Photo::DateTimeDigitized
> > Xmp::exif::DateTimeDigitized
> > Xmp::xmp::CreateDate
> > Xmp::photoshop::DateCreated
> >
> > I don't know why the IPTC date is not present, maybe it was just
> > overlooked.
> >
> > > This new behaviour is a problem for me.  I keep my camera clock in UTC
> > > so that I don't need to worry about changing the camera clock when I
> > > travel.  However, I want the display date on my photos to reflect the
> > > local time zone where they were taken, so I change the time in the
> > > comment.  With the gThumb 3 behaviour, I need to manually correct the
> > > time every time I edit a photo's comment, rather than just editing it
> > > the first time and trusting gThumb to leave it as I left it.
> > >
> > > Is there any particular reason for the new behaviour?  If not, any
> > > chance that it could be reverted to the old gThumb behaviour?
> >
> > gThumb 3 has two possible behaviours, that you can change in the
> > preferences dialog:
> >
> > 1) keep the embedded metadata in sync with the XML metadata: in this
> >     case after reading the embedded metadata the XML metadata is
> >     updated if it differs; when writing the metadata both embedded and
> >     XML metadata are updated.
> >
> > 2) embedded metadata is not updated: in this case after reading the
> >     embedded metadata:
> >     *) if there isn't a XML comment file, the XML metadata
> >        is updated with the embedded metadata.
> >     *) if a XML comment file exists, the embedded metadata is ignored.
> >
> > - Paolo
>
> Is there any way to make the date field in the comments dialog default
> to "Do not modify"?

No

- Paolo