Photoshop Effect And Tutorial

I've been posting PSD file every Tuesday for two weeks in a row now. I might as well start calling this event PSD Tuesday..like that song Ruby Tuesday. {Well, to be honest I wasn't really familiar with that song until someone sang it on American Idol}. Enough with my rambling. I'm calling today's color effect, Dark Chocolate. Apply this effect to the right photo, you'll see the similarity with