[img=http://i0.kym-cdn.com/photos/images/newsfeed/000/517/111/fbd.jpg]

Different light colors (spectrums), and the light with them get absorbed by different materials. It's what affects how we see colors of various things, such as your skin. Hence your skin absorbs the green spectrums with it's pigments, while not the orange.... I dunno if I'm explaining it right, but, I think that's the way it works.