How can i tell if my printer needs ink?

i have the photosmart 7760. It's not printing my pictures veryy well.


does this mean its running out of ink? and what kind of ink does it use?How can i tell if my printer needs ink?
when the ink on your paper starts to look faded.





http://www.hp.com/country/us/en/prodserv/laser-toner-ink-cartridges.html?jumpid=ex_hpwwipg_google_supplies%26amp;tafcjnef=fy09%26amp;ppc=DSp112413619

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