Forum Moderators: open
try this search: exif metadata site:imagemagick.org [google.com]
Don't know if the GD toolkit supports it, but for this level of complexity imageMagick is better anyway.
Costs for setting it up, sheesh, it could be anything, depends on what you have in place, the environment, the control over installation of ImageMagick. You may find a bedroom coder to take it on for $100 or with a pro it could cost a grand to do it right the first time, who knows. :-)