A question I am regularly asked is how to take a photo, remove the color so that it's black & white.
What some people don't know is that you can also drag over it so that the B&W blends into color. You basically end up with a nice transition from no color to color.
While there are many ways to do achieve this look, listed below you will find the easiest way to accomplish your goal.
Open the color image you wish to modify.
Select all and COPY the full image
Click on Mode and reset the color to Grayscale, say "Yes" to remove all color.
The image should go grayscale. Play with the black and white until it suits you.
Return to MODE and return the image to RGB
Select the Move tool (Tap: "V") and then PASTE
The original color returns to the file on a new layer.