Blackface or a black face?

Black face costume


Gawker: Julianne Hough Makes a Very Bad Halloween Costume Decision


The comments are the most interesting part of this gawker post.  One commenter said,

“Its not blackface if you are doing a certain person. It is a black face.”

Another said,

“Exactly. Intent is everything here. Black face was racist because it was racist in practice. Dressing up as a black character isn’t racist unless it is offensive and is meant to be racist. Dressing up as a black character you admire isn’t racist, it’s a compliment.

Thoughts?  Comments?  Is intent everything?