How to get an Image Attribute?

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In my pagetype, I'm pulling in a Page Attribute of the type Image/File that I am placing onto the page.

On the image that I'm pulling in, there is an attribute attached to the image for a Photo Credit byline.

How can I get that attribute from my pagetype template?

Page Type Template -> Calls Page Attribute for Current Page of Image/File Type -> Calls the Photo Credit Attribute attached to that Image

Make sense?

Thanks!

leinteractive