Sometimes the images you work with are way to contrasted and you want that slight Film Noir feel. Here’s a simple tutorial on how to achieve that effect.
First you start with your image:
Now create a new layer and fill it with black. Then set that layer to Hue. This should have turned everything black and white. Then create a layer mask on that layer and with a round soft brush and opacity of 30% or less, brush gently on the areas you don’t want to be fully black and white. For this example, I want the faces and parts of the uniform to show a tint their original color.
Next create a new layer and set it to soft light. Using a soft round brush with about 50 opacity, brush the areas in black where you want there to be a darker shade. On the same layer, you can brush with white to highlight the areas you want to be brighter. As shown below, I made the top and bottom of the image darker but their faces brighter to show contrast.
The last step it to add a little Noise Filter to spice things up. Create a new layer and fill it white. Then go to Filter>Add Noise and set the noise to about 150%, Uniform and be sure it is Monochromatic. Then set the layer to Soft Light and a low opacity of about 20-30%. Create a layer mask on this filtered layer as well and with a soft round brush of 50% or less, brush black on the parts you don’t want to have that much noise on. I did this on the faces because I don’t like having too many spots on skin. Voila, you are done.