Hi there,
The naming convention used for proxies in Premiere is very simplified so editors don't get bogged down in too many details. Here's how they would translate to a custom preset:
- High = ProRes Proxy, 1920x1080
- Medium = ProRes Proxy, 1280x720
- Low = ProRes Proxy, 960x540
One important note: the presets all contain the STRETCH TO FILL flag. This enables Premiere to stretch or squeeze the 16:9 proxy to fit the original aspect ratio if the raw footage is not 16:9. The proxy clip itself will look wrong on the desktop but correct inside Premiere. If you want to add this flag yourself when creating a preset, be sure to choose that "Stretch to Fill" option in the Scaling dropdown below the Preview window.
ALSO: the Proxy menu is different in v24.2.1 now. Instead of High/Med/Low you can choose Full, Half, Quarter or Custom for the proxy size. This will base the Proxy size on the raw footage and not assign specific sizes. The Stretch to Fill flag is still present.
HTH!
JVK