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> EXIF support - EXIF preview image is gone when saving
Guest_Heiko_*
post Jun 3 2003, 01:40 PM
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Hi Peter,

many thanks for continuing the development of PMView for OS/2.
I've downloaded the new release and was surprised that the most important feature (for me) I missed so far is now implemented in almost exactly the way I was hoping for.
I'm talking about the EXIF support for JPGs from digital cameras.

Many programs only keep the EXIF data without adapting them to the changes you did to the image. I've seen that PMView will adapt the values (checked out the size and the orientation so far) according to my changes. GREAT !!!

But I also figured out that the preview image that is part of the EXIF data is gone when saving. Is there a way the recreate the preview out of the image data like for the thumbnails ?
If not, this would be a great enhancement. (So far I'm only aware of one tool that is able to do that, Exifer. But that's a Windows program and I'm working on OS/2 sad.gif )

Thanks,
Heiko
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magog
post Jun 5 2003, 08:52 AM
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From: Germany
Member No.: 147



Hello Peter!

1.) Modifying EXIF data
Yes, not all should be allowed to change but keywords, description, author and copyright (don't know if it's available in EXIF...must look in the docs) should be ok.

If GPS is already stored it should not be changed, unless the user wants to change it.
The other thing is, you may want to ADD this information, because your camera doesn't support it (only very expensive professional cameras have a GPS module), but you have the data (e.g. PDA with GPS module,...).

I know it's some work to implement this stuff, because you allways have to check the user input and some parts of EXIF are grouped together (e.g. Software and Date/Time)

2.) updating EXIF information
If I change the picture with PMView (also saving it under a new name) should always update the timestamp and application tag. But you can of course add a checkbox in the options.

3.) IPTC (http://www.iptc.org/)
Iptc has the copyright info. Here everything should be able to change and add.
But this format is complex (http://www.iptc.org/site/subject-codes/index.html), so a subset should be ok. wink.gif

Maybe you also want to take a look at this program (Win only):
http://photothumb.com/iptcext/

Regards,
Juergen Ulbts (Germany)
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