Thank you Hugh for the pointer. I missed that item in Wikipedia when I
looked. Indeed it appears that I made minor mods to the pictures with some
program and it destroyed the EXIF info. Unfortunately, on further
inspection, it appears that I never kept the "untouched" original photos as
they came off the camera. Not a tremendous loss, but a lesson learned for
the future.

Peter Shkabara
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-----Original Message-----
From: Hugh Vandervoort [mailto:[log in to unmask]] 
Sent: Saturday, July 07, 2012 5:48 PM
Subject: Re: jpg EXIF information

Good question, and I don't know the answer, but (Wikipedia):
"The derivation of Exif from the TIFF file structure using offset pointers
in the files means that data can be spread anywhere within a file, which
means that software is likely to corrupt any pointers or corresponding data
that it doesn't decode/encode. For this reason most image editors damage or
remove the Exif metadata to some extent upon saving.[7]"
"Exif data are embedded within the image file itself. While many recent
image manipulation programs recognize and preserve Exif data when writing to
a modified image, this is not the case for most older programs. Many image
gallery programs also recognise Exif data and optionally display it
alongside the images."
http://en.wikipedia.org/wiki/Exchangeable_image_file_format
A quick test shows that even PS 7.0 modifies this data, but not to any great
extent.
Photos that are cropped lose the vast majority of the data.
My only suggestion would be to use newer software for your editing.

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