Black backgrounds in pictures do not necessarily need black materials like clothes or walls, but instead, it’s solely dependent on the light in use.
Below is a helpful tip on how to achieve that according to https://skylum.com/blog/how-to-create-black-background-on-your-photos
Figuring Out When the Light is Right
To have the capacity to see when you can accomplish a photograph with a dark background you have to know when the sun is correct. You have to see the distinction in the light esteem that is regarding your matter and your experience.
Doing this necessitates you overlook a portion of the detail that you can see, so you start to consider more to be your camera does. This is a decent ability for a photograph.
To enable you to check whether there will be sufficient complexity in a scene, squint your eyes and take a look at the stage. When you squint, you won’t see a significant part of the detail in the darker zones; features will emerge more.
By taking a look at a scene, you will have a hint of what your photo can resemble. If there is too little differentiation in a view when you are squinting at it, this will be progressively discernible.
Utilizing Natural Light
For a portrait, If you are inside and utilizing natural light, you can position your subject near an open entryway or window. Close the various entryways and window covers. Turn off any electric lights. You need the space to be as dull as could be expected under the circumstances.
If you have dark scenery, hang this as far once again from your subject as you can. Contingent upon how dim the room is, this may not be essential. Utilize the squinting method referenced before to enable you to see where the brilliant regions are.
Choose your camera edge with the goal that you abstain from seeing any light territories out of sight. If you are utilizing a background, ensure you can’t see the sides or top of it in your frame
If you can, you may need to change your focal point or draw the foundation nearer to your subject. Be mindful so as not to move the foundation to an extreme.