I'm not an AE expert and find this filter confusing. Tried looking up more info on it but didn't find answers to the following:
1) What is the 'Preview Region' exactly? The name "preview" would seem to imply that it renders a smaller region while editing, for performance sake maybe, whereas the effect would be applied to the entire frame at render time. It doesn't seem to be the case.
2) If true, how can I apply such an effect to larger video sizes? The 'Preview Region' is capped at 1024x1024 pixels max, but my footage is 1920 wide.
Thanks!