Include information from a previous webpage on a contact form

Include information from a previous webpage on a contact form

I'm trying to figure out how I can include information from a previous
webpage on a contact form, the site is running Wordpress. Here is my
scenario:
I have an image gallery and a button on each image, below the image caption.
This button links to a webpage with a contact form where a user fills in a
few choices about the image.
This form is then emailed to the website owner.
How can I include the image caption from step 1 in the contact form?