why are a 4k and HD export the same file size?

Forum|Forum|7 years ago
November 20, 2018
1 reply
6556 views

im exporting a short film in 4k and HD

and it appears that the size is more or less exactly the same regardless of the resolution

on the other hand if i increase or decrease the bit depth, it has a dramatic effect on the file size

why is this?

i would have imagined that a 4k file would logically be bigger than a HD file

This topic has been closed for replies.

My Trucking Skills

Inspiring

what are the dimensions of the HD file?

D

djmattyzAuthor

Inspiring

1920 x 1080

vs

3840 x 2160

R Neil Haugen

Legend

i understand yes, its my job to know. BUT premiere did guess a bit rate of 10 to begin with, so if ,as you say the bit rate MUST be increased as we increase the resolution, in order to prevent a reduction in quality, then i would have imagined that premiere would increase it automatically as i increased the resolution to maintain the same quality.

i dont really need small file size, i basically want a master copy of the film, the best quality i can get. then i will do smaller copies for online use etc. where i can work at a reduced bit rate

20 seems to look pretty good at 4k

its made using sony A7sii camera.

You might think ... but then, it's best not to assume, right?

I know a number of people that for a master might be up to say 25-30=avg, 40 or more max for a 4K output. All depends on how much detail you expect to preserve. If it's only gonna end up online anyway, well ... not nearly so crucial of course. Smaller sizes work entirely adequately for online use.

Neil

Everyone's mileage always varies ...

Sign up

To post, reply, or follow discussions, please sign in with your Adobe ID.

Sign in to Adobe Community

To post, reply, or follow discussions, please sign in with your Adobe ID.

Scanning file for viruses.

This file cannot be downloaded