I'm trying to work with this photo in Illustrator CC, but there is this black box in the center of the page. I tried ignoring it but when I save my image, it only saved whats in the black box....yet I can't seem to decrease the size to just the box. I'm sure there is a very simple reason for this but I can't figure it out. I'm self taught with Adobe so some basic things have been caught later on (and usually when I'm under a deadline).
@scott is right, this is your artboard. Just a little bit more information as per your comment: if you want to keep the size of the image, you want to change the size of the artboard.
You can do this by finding the artboard button:
...and then either:
- double click on your image (should there be more than one element, you might have to group them first).
- use the handles on the artboard to alter the size manually.