oversampling when reframing 4K material in a 2K sequence?

[ideami]

Im working on a short film shot on 4K , output will be 2K , and im doing a lot of reframing taking advantage of the 4K within a 2K output, im doing all this in Premiere,
until now what i did was to create a sequence 2K 2:1 , and putting the editing with the original 4K files there, its very easy then to reframe, and i was very happy doing it

until i read an article here

http://cineform.blogspot.com/2008/10/oversampling.html

that seems to state that doing it that way could cause loss of quality, and that the right way to do it would be to apparently work on a 4K sequence and then zoom on the 4K sequence

anybody has any comments about this, is it really a problem to reframe directly on a 2K or 1080p sequence the 4K material, in premiere?

the problem they say seems to be that the resizing may be happening in 8 bits , maybe thats the problem

its a pity because i was thinking in working in an 1080p sequence, reframing there the 4K material, and that way i could render previews easily as well, if i have to reframe and work on the 4K sequence then i cannot render previews there

thank u for any help
javier

 

[jimhare]

Hi Javier,

In my opinion, oversampling is very important for creating a nice image. In other words, I try to frame everything at 1:1 at 4k and use the entire image for a 2k, 1080, and even SD finish.

Reframing is extremely useful for polish, or to get you out of a bind, but I wouldn't personally shoot wide and rely on zooming.

There was an interesting discussion about this a couple of weeks ago if you want to search for it.

As for the best way to do it, I prefer to zoom specific shots in Red Cine and output full quality if I do any zooming.

 

[ideami]

thanks a lot, i would love to see that discussion but cant find it, do u have the link to it? thanks so much, jav

 

[JoshBertrand]

I don't use Premiere and can't comment on that, but if you have After Effects, you can bring in your Premiere timeline and resize in AE which always uses the full 4k resoultion. I do this frequently for doco work especially on single cam interviews. Works like a charm. Try not to punch in to the full 100% if you can, so that you can reap the benefits of a little oversampling.