Re: Comments in image files

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.


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Relevant Pages

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