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Downsize then size up again with nearest neighbour interpolation. Imagemagick can do it.

Too bad Trumbull (I think it was him) didn't have Imagemagick when the original "Westworld" was being filmed.

Not Doug Trumbull, it was John Whitney Jr and Gary Demos at Information International Inc (Triple-I) who did the Westworld “android vision” effect.

Thanks for clarifying. Too late to edit my original post.

Used to do exactly this for reference when learning how to do drawn pixel art