On Mar 23, 2008, at 8:30 AM, Charles Robinson wrote:
> On Mar 23, 2008, at 10:27, Doug Franklin wrote:
>> Some of the EXIF metadata fields, and maybe the IPTC ones, too, allow
>> software like Bridge and Photoshop to embed in the photo the fact
>> that
>> they were used in the processing of the image. It's possible that
>> ACR
>> is updating these metadata values, even if it doesn't modify the
>> image
>> data. You could try using something like exifer a TIFF tag dumper to
>> write the metadata before and after to two different text files and
>> compare them to see if there are changes there.
>>
>
> That sounds like a good clue, thanks!
>
> I also just figured out that I can set the preferences for my photo
> folders to show the "Date Created" field in a column along with (or
> instead of) the "date modified" field. "Date Created" doesn't change,
> so that's a relatively painless solution. I'll see if I can figure
> out what's being changed in the files, though, just for the fun of it.
The latest versions of Camera Raw, as well as Lightroom, will save
metadata edits for IPTC data into JPEG files.
Date Created and Date Modified fields visible to the file system are
different from the "Data/Time Original" ('Capture Date') timestamp in
the EXIF data.
Obtain a copy of EXIFtool ... free from
http://www.sno.phy.queensu.ca/~phil/exiftool/ ...
and look at a JPEG file prior to opening it with Camera Raw. Then
open it, edit something, etc, close it, and run EXIFtool on it again.
You'll see exactly what changed.
Godfrey
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