I was just working a green screen photo booth thing for the Tech club at my school and we were using a green screen with gimp/photoshop to manually using a chromakey mask.
Is there any way to do this with this software and get a live preview?
Well you can add a webcam/camera picture live into obs and use the Chroma Key, also live of course: http://jp9000.github.io/OBS/sources/directshowvideo.html
The projector of OBS can output this in fullscreen to another monitor to see the "final" picture. Since you used photoshop/gimp so far, you probably only worked with images right? The Image source of OBS also has a Color Key option to remove a color.
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