I am trying to do something difficult. I am trying to create a nighttime black and white image, of a man walking down a road. I need the road and scenery to be B&W, but the man illuminated by a spotlight, and I need him and the spotlight area on him in color. "Blending" in Photoshop won't work. I don't want a ghost man, nor do I want a ghost street. And I want my colored man's spotlight to fade perfectly into the black and white scene, so the cheap B&W roses with red petals technique won't cut it.
I was thinking about using the multiple exposure mode in my camera, shooting the scene in B&W, and then switching over to color and illuminating the man for the second exposure, but my camera won't let me switch color modes between the two exposures.
So my only idea left is to use a single exposure shot in color, and after I'm done illuminating the man in the middle, slide a filter (or set of) filters in front of my lens, that effectively blocks out all colors, and my camera starts to see B&W and record the street as such. I don't think this is possible, though. I don't think you can turn light into B&W light.
Any ideas, guys? I'm beginning to think this isn't possible.