Access Image Metadata

Hi!
I'm attempting to create a photo uploader as part of a school project, and I was wondering how I can access, and edit, the metadata for the images I'm uploading. I want to change the tags, description, etc. I tried Googling, but it didn't return anything I can use.
I also suspect it might not be possible to edit metadata in Flex. If so, is there another way I can do this?
By the way, I'm using Flash Builder 4.5 Premium, with Flex 4.5.1 SDK.
Cheers
Mark

I've not tried this but it looks promising
http://code.google.com/p/exif-as3/

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image-metadata.sh:
#!/bin/bash
if [ $# -lt 2 ]
then
echo -e usage: "$0 <action> <filename>\n actions: edit-comment, edit-tags"
exit -1
fi
action=$1
file=$2
if [ "$action" == "edit-comment" ]
then
commentText=$(echo | dmenu -t "$(exiv2 -Pt -g Exif.Photo.UserComment $file)")
if [ $? -ne 1 ] # not aborted
then
if [ -z "$commentText" ]
then
exiv2 -M"del Exif.Photo.UserComment" $file
else
exiv2 -M"set Exif.Photo.UserComment $commentText" $file
fi
fi
fi
if [ "$action" == "edit-tags" ]
then
exiv2 -Pt -g Iptc.Application2.Keywords $file > /tmp/._image_keywords.txt
selection=$(exiv2 -Pt -g Iptc.Application2.Keywords $file | dmenu -sb "#000" -nf "#aaa" -nb "#222" -sf "#509ba6" -fn 'Deja Vu Sans Mono-14:bold' -l 10)
if [ -n "$selection" ]
then
exiv2 -M "del Iptc.Application2.Keywords" $file
while read keyword
do
if [ "$selection" != "$keyword" ]
then
exiv2 -M "add Iptc.Application2.Keywords String $keyword" $file
else
deleted=true
fi
done < /tmp/._image_keywords.txt
if [ -z $deleted ]
then
exiv2 -M "add Iptc.Application2.Keywords String $selection" $file
fi
fi
rm /tmp/._image_keywords.txt
fi
if [ "$action" == "show" ]
then
comment=$(exiv2 -Pt -g Exif.Photo.UserComment $file)
exiv2 -Pt -g Iptc.Application2.Keywords $file > /tmp/._image_keywords.txt
echo -n Comment: $comment, "Keywords: "
first=true
while read keyword
do
if [ $first == "false" ]
then
echo -n ", "
fi
echo -n $keyword
first="false"
done < /tmp/._image_keywords.txt
echo
rm /tmp/._image_keywords.txt
fi
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Access Image Metadata

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