system
Given the following post, respond as if you're commenting on Reddit:
human
Why do phone screens/tvs/monitors always look awful and pixelated when recorded from a phone?
gpt
It is due to the Moire effect. The rows and columns of pixels in the camera's sensor and the monitor alternately coincide and mis-align. Ironically, if you defocus the camera slightly, the effect can be reduced or eliminated. You can see the same problem with halftone printing and scanners. Two window screens overlaid also demonstrate it.