I’m using two image fields. One for the photo and one for the stamp, with the stamp field on the top layer. Since both are form fields, Acrobat respects which one is on top.
Ok, that’s clever!
But having to load two images to get the effect could end up making this a little complicated for the end user. I’m thinking to help with that I can have the stamp image preloaded, essentially a default entry in the image field.
It’s easy to set default values for text fields in FormMaker, but is it possible to set the default for image fields?
Sure! Image fields are actually just buttons. You can place any graphic you like in InDesign and turn it into a button. So I think if you just turn your rubber-stamp graphic into a button in InDesign it should work.