How does shrinking 4:2:2 to 4:4:4 actually happen?

[Max Field]

Over the years I've heard the concept of taking 4K 4:2:0 footage and finishing in 2K and it becomes 2k 4:2:2 by nature of oversampled data into a smaller imagespace.

The logic makes sense to me but I can't figure this out for the life of me... Do you need to manually transcode/convert the footage to achieve this? Or will putting it into a smaller Resolve file resolution just automatically achieve the oversampling result?

I haven't had the time or situation to try it myself.

Thanks as always.

[Max Field]

Bumping because I don't have a monitor big enough to see the results to try it myself. If anyone has input on this please reply.

[David Mullen ASC]

Here are some conversations on the topic. It seems that the general advice is to first convert to RGB from YCbCr before downsampling to 2K or 1080P, but there is also some opinion that there isn't any real improvement in a visible, practical sense.

https://www.eoshd.com/news/discovery-4k-8bit-420-panasonic-gh4-converts-1080p-10bit-444/

https://rarevision.com/5dtorgb/

https://forum.blackmagicdesign.com/viewtopic.php?t=40701

https://community.fxhome.com/discussion/52309/converting-4-2-0-4-2-2-4k-to-4-4-4-1080p

 

[Max Field]

On 1/28/2023 at 7:03 PM, David Mullen ASC said:

Here are some conversations on the topic. It seems that the general advice is to first convert to RGB from YCbCr before downsampling to 2K or 1080P, but there is also some opinion that there isn't any real improvement in a visible, practical sense.

https://www.eoshd.com/news/discovery-4k-8bit-420-panasonic-gh4-converts-1080p-10bit-444/

https://rarevision.com/5dtorgb/

https://forum.blackmagicdesign.com/viewtopic.php?t=40701

https://community.fxhome.com/discussion/52309/converting-4-2-0-4-2-2-4k-to-4-4-4-1080p

 

Thanks for this, sorry I didn't get the notification when you actually sent it.