How to perfectly black out a face making it look like a shadow?

[InfernalShadow]

As the title says I would like to know how to perfectly black out a face making it look like a shadow.

Here's an example photo:


I'm currently using Photoshop CC2020

Any help would be appreciated!

 

[IamSam]

Take a look here: https://www.youtube.com/results?search_query=photoshop+silhouette+effect+

If this is not what you want, please give a detailed explanation of the effect you are after.

I used an alpha channel method to go from this...


...to this.


You can easily change the BG color as well....


The alpha channel method is explained in some of the videos I have linked you with.

 

[IamSam]

Another good technique is the "Threshold" method.

Select the subject. You can remove the background or not.


Then clip a threshold adjustment layer.



You can again change the background color by placing a solid color fill layer on the bottom.