Can I selectively colorize black and white images?
Yes, Silver Efex Pro 2 has a feature that enables selective colorization, as long as the image you begin with is in full color. The selective color slider is labeled SC inside of the Control Point and can be accessed by placing a U Point powered Control Point on an object in the image and moving the "Selective Colorization" slider. Please note, if your original image is already in black and white, you will not be able to bring the color back with Silver Efex Pro 2.
To learn more about using the selective colorization feature in Silver Efex Pro 2, please see the video below: