It’s an original capture without any Photoshop changes. In order to create such photo (with black background),
all you need is to find a right angle with shadow behind the object. Once you will focus on the object, your camera
will calculate the proper exposure for the object and all darken areas will become black.
If you would like to calculate the exposure on your subject only, please switch to spot metering mode. With this mode,
all darken areas will be even more black.
You should try it!