How do you open and save PNG files as images rather than a document (which my MacBook is doing automatically)?

Hi,

Basically I'm doing a course in which i need to import images on a document for evidence (in particular Cirque Du Soleil, yes it's a weird course!) I am using the develop menu tab and using the Inspect Element menu. Here i have found loads of images that are perfect for my evidence, but the images are all showing as PNG files. Whenever I try to save these they will only save as Documents and not images. How can I change this so I can save them as images and import them imto Pages.

Many Thanks

Mason