Red one 4k for 2k output

DaVinci Resolve

Red one 4k for 2k output

Posted by Pablo Nóbrega on October 17, 2011 at 2:50 pm

Hi there, I’ve graded a short filmed in in 4k in a HD timeline. Now I have to output it to 2k. When I set my timeline to 2k, it gives me 2 black stripes in the sides. I know it occurs because the 2k window is 1:85 (2048×1080). Then I, ve zoomed the image outout in 6,6% to fit the whose screen. Is this the right way, lossless resolution to do this job?

Ps.: Do I have to put full resolution debayer to render the project?

thanks

Mikhail Puzyrev replied 14 years, 6 months ago 5 Members · 10 Replies
10 Replies

Margus Voll
October 17, 2011 at 4:18 pm

You have to ask what aspect you want your image to look?

As for quality 4 k to 2 k should not matter as quality will not drop.

You will probably see rendering speed difference with full debayer vs half etc.

Just make some test shots and compare if you can see difference.

—

Margus

https://iconstudios.eu
Mikhail Puzyrev
October 18, 2011 at 7:07 am

It can be that red 2k is 2048×1152. And when you go 1080p – you don’t have to zoom
Gabriele Turchi
October 18, 2011 at 12:28 pm

yep i believe that the solution is to set your timeline to 2048×1152 (RED 2K 16/9)

i always meant to ask : 2K DCP : what resolution specs support ? it seems that there are various combination of resolutions of what is called 2K …

thanks

g

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Kevin Cannon
October 18, 2011 at 7:27 pm

Re: the DCI 2K specs, the projectors are required to have a native resolution of 2048×1080, so the 1:1.85 resolution is 1998×1080, and the 1:2.39 resolution is 2048×858. It’s less clear to me if the decoder will accept arbitrary horizontal or vertical pixel counts, like 2048×1024…

KC

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Pablo Nóbrega
October 19, 2011 at 5:28 pm

In this case i’m sending it to cinevator. Think having a 2k timeline and a 4k videofile inside it, and just zoom it 6%, wont get any visible loss. But in fact, it seems to have diferent types of 2k res. I’ll discover what would be the 2k 1,85 form cinevator.
Mikhail Puzyrev
October 19, 2011 at 6:44 pm

You’ll get huge sharpness loss. But if you watch it on tiny 50 inch plasma, probably you won’t notice it. Always use projector when working for big screen.
Pablo Nóbrega
October 19, 2011 at 7:23 pm

So you think i shoud put a 1998×1080 timeline and thats it.
Gabriele Turchi
October 19, 2011 at 9:48 pm

i always wondered why RED 2K is 2,048×1,152 and not 2048×1080 …

g

Davinci Resolve Control Surface
MacPro
Cubix desktop 4
2 Red Rockets
GTX470+GTX470+GTX285
24GB RAM
HP Dreamcolor
Panasonic 58PF Plasma
Pablo Nóbrega
October 19, 2011 at 11:01 pm

2048×1152 is 1,77. Same ratio than HD… but for 1,85…? ( 2048×1107 or 1998×1080 ? )
Mikhail Puzyrev
October 20, 2011 at 11:11 am

Ask laboratory or DCP copy maker what they prefer. As for scaling – crop to 2048×1107 will produce crisper picture.

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