Re: Comments in image files


"Peter in New Zealand" <peterbalplug@xxxxxxxxxxx> wrote in message
news:gbi21t$rfi$1@xxxxxxxxxxxxxxxxxx
Also don't confuse these "Windows" fields as being OS specific (I'm sure
that comment will start a war). Since the information is stored within
the jpeg file, any OS can read and display the jpeg without any
conversion. In reality it's not the OS that is reading or updating the
EXIF/IPTC fields, it's an application, Windows Explorer in your case.

The reason why Photome, Irfanview, XnView, Picasa, Faststone, the new
Windows Photo Gallery, etc display different EXIF/IPTC fields is that it
is up to the developers of each application to determine what to call the
fields on the screen and what EXIF/IPTC fields they want to display.
However, when the application reads or writes the EXIF/IPTC fields they
are following the EXIF or IPTC standards. Otherwise the jpeg itself may
become corrupt.

--

Len

Yeah - I noticed. I messed with a jpg in Notepad (only deleted one little
space - honest), and the whole file was unreadable in any image viewer.
(And yes, it WAS a copy I was playing with.) So it's all a bit delicate it
seems. Interesting each apps developer seems to vary in what fields they
feel are important. PhotoME seems to be the most comprehensive, cheerfully
displaying the most amazing amount in data. Also, it is the only app I
have found that displays (and can edit) the "Windows" fields as well as
the others.

Ummm, yes, I see how it is confusing to refer to them as Windows fields. I
just chose that name out of ignorance as a convenience but they are
clearly embedded in the file, so I guess they qualify as EXIF ot IPTC. I
know the difference between EXIF and IPTC, and therein lies a bit of
frustration for me. I want to continue using MS Digital Image but the
fields in that don't appear in other apps that display IPTC data. Nor do
they appear anywhere in the EXIF data. So, even though they are in the
file, they seem to be considered not as important by the apps developers.

--
Peter in New Zealand. (Email address is fake)
Collector of old cameras, tropical fish fancier, good coffee nutter, and
compulsive computer fiddler.
In case anyone else is learning as much from this thread as I am I have just
been in email contact with the author of PhotoME. He tells me what I have
called the "Windows" fields are proprietary (that awful word) and MS's own
invention. PhotoME can read them, but not edit them - yet. He is thinking of
making that available in a future version. However, since only MS Digital
Image seems to make good use of them, and MS have discontinued that line of
software, the future of those fields looks dicey to say the least. I had
assumed in my ignorance they were legitimate IPTC stuff when I saw them
embedded into the file, but no, it was good ol' MS once again going their
own independant way. So DI will have to go, and it's IPTC all the way from
now on.

--
Peter in New Zealand. (Email address is fake)
Collector of old cameras, tropical fish fancier, good coffee nutter, and
compulsive computer fiddler.


.

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