A colleague of mine has created a PDF with functionality in place to allow the user to add pictures into predetermined locations in the document. His concern is that without the ability to downsample these photos automatically, the users may end up attaching photos from their 10+ MP cameras and this would result in enormous PDF documents.
Any advice or pointers would be welcome.
I imagine a plug-in could, but you should check in the Acrobat SDK forum here. Plug-ins for Reader require a special license and approval.