[Theme: Harmonic] Static Front-page background image scrolling

When I’m using high resolution images as a background image (title image) for the static front-page, I can’t see the whole image but a part of it. I would like to enable this (to show the whole background image) by letting the user scrolling all the way down. Is it possible?

Putting a background image to other pages (not title background image) it lets the user to scroll all the way down until the image finishes, that’s what I want to do in front-page intro as well.

Thanks!