Have you ever recorded a program in the past, but the broadcast was HD quality, but the saved version was SD quality? I have. The high definition video ended up being 760x480 when I recorded it.
However, with the advent of AI, this inconvenience has been somewhat improved. This time I also upconverted to 4K. It was simple and worked quite well. The tools I used were Topaz Video AIWhen I tried it on my MacBook Air M2, it got thermal throttling, so I cooled it down with ice packs. (It's clear that the Pro is better suited to my usage, given the limitations of the external display.)
There is a limit to how much appeal a photograph can convey, but it still comes out clearly like this. Not only is there a big difference in not having interlacing, but you can also clearly see the difference in texture in hair and skin. When you look at musical instruments, the results are very beautiful.
The 720x480 image before conversion is blurry.

On the other hand, after conversion to 4K, Seiji Ozawa's heroic figure has been improved in every aspect, including his hair, skin texture, and the contours of his fingers.

The persuasiveness of ensemble scenes has also changed completely.

(Source) NHK Dream Concert Hall Seiji Ozawa Special Part 2 "Bavane for a Dead Princess"

(Source) NHK Dream Concert Hall Seiji Ozawa Special Part 2 "Bavane for a Dead Princess"
What a great time we live in when all this can be done with just one click.1