Video and image specifications Background image dimensions
Make sure not only your face is illuminated, but also some of your background as well, as the contrast can help distinguish you from the background. This method requires more system resources, so it has higher system requirements. This is because without a solid, contrasting color behind you, the system is less likely to accurately distinguish you in the foreground from the background. Virtual Background without a green screen provides the same effect as when using a green screen, only with less sharpness and definition around your face, head, ears, and hair. 
Do not wear clothing that is the same color as the virtual background.Higher quality cameras result in a better virtual background.Recommended physical green screens from Webaround or Amazon.
The contrast in colors makes it easier to distinguish you in the foreground from the bright background.
Use a very bright and distinct color, such as a green or blue screen. This method improves the sharpness and definition of the virtual background effect around your face, head, ears, and hair. This method requires you have a solid-colored screen, curtain, or wall behind you, which Zoom will replace the selected color with the image or video you selected. Virtual Background with a green screen provides the best virtual background effect and uses less system resources during the meeting. Your computer or device meets the system requirements for Virtual Background. Prerequisites for video conferencing virtual backgrounds Troubleshooting Virtual Background issues. How to manage Virtual Background for Admins. Recommended setup without a green screen. You can also use Virtual Background in a Zoom Room, or a simpler Mask Background feature in the web client. 
Lastly, if you don't have your own images or videos for use as a virtual background, you can use nothing and just blur the background instead.
Just as with a virtual background without a green screen, a video virtual background requires more system resources, and thus has higher system requirements. Additionally, instead of a static image, the virtual background feature, with or without a green screen, allows you to select short videos as your virtual background.
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