Step 1: First open the picture in which you want to have some objects of the image colored while the rest black and white.
Step 2: Select Channel Mixer option in the Layer Menu.
This makes a new layer for Channel Mixer which is shown in layer palette.
Step 4: Now select the brush tool as shown in the figure below. Make sure that the foreground color and background color are set to black and white respectively.
Step 5: Now select the brush size.
Step 6: Using the brush highlight all the objects you want colored. Select the appropriate brush size for small details.(Do as shown below)
Here is the final image.
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