Hawaiian birth certificates in 1961 were black with white print. This style was through at least November 1968 at Kapiolani Medical Center (and at all Hawaiian hospitals). See http://www.homegrownhawaii.com/boards/thread.aspx?tid=184&group=HH, which is a website where Hawaiians indicated which hospital they were born and described what their birth certificates looked like.
There is a report in 1968 that another style of Birth Certificate was being used, such as was described in this article. Green, but with black type and a statehood seal. But given the timeframe of Obama’s birth, 1961, his birth certificate would have been black with white print, the style used by all Hawaiian hospitals at that time. The copy shown in this article was definitely not a copy of the original.