ProRes color shift when playing in FCP

[David Burrows]

It’s a high enough frame size that gives us a 2.35:1 aspect ratio for feature film work…

[David Burrows]

or to answer your question more accurately..

1828×778 is precisely half the vertical resolution of a 2K cinemascope anamorphic frame on film as recorded through an Arrilaser, and gives huge benefits in terms of resolution vs file size. This meant no interpolation of pixel data apart from fitting the vertical resolution to the anamorphic frame size.

[Alexander Feichter]

hmmm, trying to understand…

you do this for avoding interpolation/filtering on downsizing?

if you’d really take only every second line of the original frame the result would have clearly visible aliased edges.