EXIF data for PNG files

I seem to have lost all EXIF data for pictures that I first converted to PNG format, and then edited in iPhoto.
The EXIF data is still there in the copies of the files in the "Originals" folder in the iPhoto Library. If I open these files with Graphic Converter, I can see the EXIF data.
But the EXIF data seems to be missing from the PNG files in the "Modified" folder.
Is this some sort of quirk with PNG files in iPhoto?
Dual 867 G4   Mac OS X (10.4.9)  

smbrannan
I just googled this and the issue appears to be that png does not support EXIF data, or if it does, only in a very limited way. I'm no expert in this field but have a read of this:
http://heim.ifi.uio.no/~gisle/blog/?p=3
or this
http://www.flickr.com/forums/bugs/14168/
as this person obviously knows something about it.
Regards
TD

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