Hi

If filmed with 4K/2,7K, will the image be lossless in means of enlargement if it in post and is zoomed to 1080?

What I mean is to zoom the 4K to 150% in a 1080 sequence and same with 2,7K but 139% ?

Hope it makes sense what im asking

No you will always lose some quality when you recodning an H.264 video. You need to shoot RAW to avoid loss of quality and your camera can not do that.

Regards Leif.

It will be lossless as your actually scaling DOWN by 50% so will look just a great at 1080p from 4k if not better

Landbo Posted at 2018-6-15 03:46
No you will always lose some quality when you recodning an H.264 video. You need to shoot RAW to avoid loss of quality and your camera can not do that.

Regards Leif.

But in regards to pixels etc - if 4K is zoomed 50% within av 1080 frame, will it not be as a "cutout" that is 1920x1080 with the original pixels? Thinking that filming in 4/2,7 will be a good solution to be able to align correctly and zoom when the output is to be 1080?

Aerial-Image Posted at 2018-6-15 04:28
It will be lossless as your actually scaling DOWN by 50% so will look just a great at 1080p from 4k if not better

Thanks - as well as beeing able to zoom/align the image to correct composition and not lose quality in 1080 output?

sonnavindDF Posted at 2018-6-15 05:06
But in regards to pixels etc - if 4K is zoomed 50% within av 1080 frame, will it not be as a "cutout" that is 1920x1080 with the original pixels? Thinking that filming in 4/2,7 will be a good solution to be able to align correctly and zoom when the output is to be 1080?

I wish it was as simple as you outline. H.264, which is the normal coding for hobby cameras, makes a full frame every eighth time and fills the remaining seven with only those areas that change in the image. That coding DJI uses is known to me not lossless.

You can read about the technique here:   https://en.wikipedia.org/wiki/H.264/MPEG-4_AVC

Regards Leif.

Landbo Posted at 2018-6-15 11:35
I wish it was as simple as you outline. H.264, which is the normal coding for hobby cameras, makes a full frame every eighth time and fills the remaining seven with only those areas that change in the image. That coding DJI uses is known to me not lossless.

You can read about the technique here:   https://en.wikipedia.org/wiki/H.264/MPEG-4_AVC

Every time you re-encode H264 video there are some losses, but that is a different issue from the zooming.  

As long as the zooming is less than or equal to 200% (zooming in on a 1080 area of the 4K video) then the losses will be no more than the normal losses for re-encoding H264 video, and for most people the losses from doing this once are invisible.  The losses are cumulative though so you don't want to edit the edit of an edit of the original if you are using H264 to encode all stages, do all your editing in one go or use lossless intermediate stages.