system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does scaling to 1440p work?(upscaling/downscaling from 1080p/4K)
gpt
If downscaling, you take every 4th pixel to get from 4k to 1080p. If upscaling you make up pixels to go between the existing pixels. This is done typically by averaging the nearby pixels.

Obviously 1440 isn't a perfect fraction of 4k, so the math is a little more complicated, but the process is the same.