I found a script on another website which accessed the Faces information in iPhoto. After digging through the database formats and making considerable changes, I have produced this version which allows you to view information on any number of selected photos, and/or obtain a full list of face information in your current database. This ability could be useful in any number of situations where you want to obtain the Face data. For example, I want to create a website that not only allows people to browse by photo, but also by the people in the photos.


-- Get Aperture Face Names
-- © 2012, Tim Doyle
-- Based on mr. applescript's iPhoto script, posted at http://hints.macworld.com/article.php?story=20090302060210294

tell application "Aperture"
activate

set the selected_items to the selection
repeat with z from 1 to the number of items in selected_items
set this_photo to item z of selected_items
set the query_results to my extract_face_record(this_photo)
if the the query_results is not false then
set AppleScript's text item delimiters to return

repeat with i from 1 to the count of the query_results
set the info_list to item i of the query_results
if i is 1 then
set the dialog_text to the info_list as rich text
else
set the dialog_text to the dialog_text & return & the info_list as rich text
end if
end repeat
set AppleScript's text item delimiters to ""
display dialog dialog_text
end if
end repeat
--select selected_items
end tell

-- Get and display the names of all Faces in the current Library
set the face_names to my get_all_faces()
repeat with z from 1 to the number of items in face_names
set this_face to item z of face_names
if z is 1 then
set the dialog_text to this_face
else
set the dialog_text to the dialog_text & return & this_face
end if
end repeat
tell application "Aperture"
display dialog dialog_text
end tell

on extract_face_record(this_photo)
set Aperture_library_path to do shell script "defaults read com.apple.Aperture LibraryPath"
-- expand the '~' if it's in there
set Aperture_library_path to do shell script "echo " & Aperture_library_path
if Aperture_library_path does not end with "/" then
set Aperture_library_path to Aperture_library_path & "/"
end if

set the Faces_database_path to Aperture_library_path & "Database/apdb/faces.db"
set the Aperture_database_path to Aperture_library_path & "Database/apdb/Library.apdb"

-- Get the UUID for this photo version
set the photoID to the id of this_photo

-- Look up the UUID for the master of this version
set the masterID to my SQL_command(Aperture_database_path, "select masterUuid from RKVersion where uuid=\"" & photoID & "\";")

-- Look up the face keys for all faces in this master photo, list them from left to right
set the face_keys to every paragraph of (my SQL_command(Faces_database_path, "select faceKey from RKDetectedFace where masterUuid=\"" & masterID & "\" AND rejected=0 AND ignore=0 ORDER BY topLeftX;"))

-- create a list for each face {short name, full name, email address}
set the face_records to {}
repeat with this_key in the face_keys
set this_face_info to {}
-- get name
set the short_name to my SQL_command(Faces_database_path, "select name from RKFaceName where faceKey=\"" & this_key & "\";")
if short_name is "" then
set short_name to "unnamed"
end if

set the end of this_face_info to the short_name

-- Additional fields, if desired

-- get full name
-- set the full_name to my SQL_command(Faces_database_path, "select fullName from RKFaceName where faceKey=\"" & this_key & "\";")
-- set the end of this_face_info to the full_name

-- get email address
-- set this_email to my SQL_command(Faces_database_path, "select email from RKFaceName where faceKey=\"" & this_key & "\";")
-- set the end of this_face_info to this_email

set the end of face_records to this_face_info
end repeat

return face_records
end extract_face_record

on get_all_faces()
-- Get the names of all faces in this database
set Aperture_library_path to do shell script "defaults read com.apple.Aperture LibraryPath"
-- expand the '~' if it's in there
set Aperture_library_path to do shell script "echo " & Aperture_library_path
if Aperture_library_path does not end with "/" then
set Aperture_library_path to Aperture_library_path & "/"
end if
set the Faces_database_path to Aperture_library_path & "Database/apdb/faces.db"
set the face_names to every paragraph of (my SQL_command(Faces_database_path, "select name from RKFaceName ORDER BY name;"))
end get_all_faces

on SQL_command(database_path, command_string)
return (do shell script "sqlite3 " & (quoted form of database_path) & " '" & command_string & "'")
end SQL_command