The term "Color blind" when being applied to humans doesn't mean they see in black & white. The colors are often jumbled or sometimes switched around. One of the most common forms is red and green being reversed or appearing more brown.
Feed the Birds. It's not just a song, it's a way of life.
Yeah, colorblindness has nothing to do with being blind to color. Never having been colorblind, I can't speak from experience, but I'm sure it'd still be quite a spectacle. The colors would simply be somewhat less varied than what folks with "normal" vision see - which is what colorblind people would be used to, anyway.