It is possible to use a white background as a green screen, although it is not ideal. When using a green screen, the goal is to remove the background of a video or image and replace it with something else. The reason green is typically used is that it is a color that is not often found in human skin or clothing, making it easier to differentiate from the subject. However, if you don't have access to a green screen, a white background can be used instead.
When using a white background as a green screen, it is important to ensure that the lighting is consistent and even. Any shadows or variations in lighting can cause issues with the keying process, which is the process of removing the background. Additionally, it is important to ensure that the subject is not wearing white clothing, as this can cause the clothing to blend in with the background.
One advantage of using a white background is that it is often readily available, as many walls and backdrops are white. Additionally, white is a neutral color, which can make it easier to add different backgrounds without color clashes.
However, there are some disadvantages to using a white background as a green screen. One issue is that it can be more difficult to get a clean key, as white can reflect light and create unwanted shadows. Additionally, it can be more difficult to differentiate between the subject and the background, especially if the subject is also wearing light-colored clothing.
In summary, while it is possible to use a white background as a green screen, it is not the ideal choice. It is important to ensure that lighting is consistent and even, and that the subject is not wearing white clothing. While white may be more readily available than green, it can be more difficult to get a clean key and differentiate between the subject and the background. It is always important to test different options and choose the one that works best for your specific project.
"White Screen Vs Green Screen: Which One Is Better for Your Next Project?" by Yuriy Martsenyuk, Fstoppers, 29 October 2019, https://fstoppers.com/education/white-screen-vs-green-screen-which-one-better-your-next-project-409483.