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How to fix or make a perspective image flat in Adobe Photoshop? And how to do a screen replacement in After Effects?

  1. Edit > Perspective Warp.
  2. Draw the plane/corners
  3. Switch to Warp
  4. Redraw a flat plane to map the image correctly.

Reference:

https://helpx.adobe.com/photoshop/using/perspective-warp.html

 

Screen replacement video:

Bad Joe: