I'm trying to run a little function to determine the luminance of an image and store that in the post_meta for that image..
I have the function working, but id like it to fire when an image has finished uploading.. does anyone know the function/filter/action i should hook into for this?
perhaps the one that creates the '_wp_attachment_metadata' postmeta?
Thanks in advance
PS. will happily post my code when i can get this all sorted :)