To get around not being able to display the extended metadata in iPhoto '11, I wrote this applescipt. Feel free to use if you are comfortable enough with applescript:
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#Script to view the complete EXIF Metadata for a photo on MacOS. To use, the "exiftool" perl script by Phil Harvey must be installed on the system (http://www.sno.phy.queensu.ca/~phil/exiftool/)
#Designed to able to drag and drop a jpg, etc into to this application.
#Written January 29, 2012 by Bryan MacKinnon and based on the work by others.
#Installation: 1) install exiftool, 2) create an application of this script from the applescript editor. If you put the app on the desktop, then you can drag and drop directly from iPhoto '11
#Usage: Drag and drop the photo onto the application icon. A terminal window will be displayed with the output.
set filecount to 0
# For each file specified as a parameter, run exiftool to display the metadata
on open filelist
repeat with i in filelist
set filecount to 1
tell application "Terminal"
set filename to do shell script ¬
"perl -e \"print quotemeta ('" & POSIX path of i & "');\""
do script "exiftool " & filename & "; exit"
end tell
end repeat
end open
# If no files were specified, then simply run exiftool which will display the help info.
if filecount < 1 then
tell application "Terminal"
do script "exiftool; exit"
end tell
end if