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Create and Export LUT for Alexa LOG Footage

COW Forums : DaVinci Resolve

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Jay LeeCreate and Export LUT for Alexa LOG Footage
by on Mar 7, 2011 at 8:24:12 pm

Hi guys,
This function not evident in the current manual.
Would like to import Alexa LOG footage (ProRess 444) create a LUT from a 'Grade' with which to export the LUT and forward to the post house. They are generating off-line files for editorial and I would like to give this footage more love than an off the shelf Arri LUT.
Is this possible?


Cheers,

J


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Dan MoranRe: Create and Export LUT for Alexa LOG Footage
by on Mar 7, 2011 at 10:31:58 pm

You can indeed!

Grade as normal then you need to :

grab your grade as a still.

I normally save it to the power grade library

Make a new project (not necessary but I think it\'s the quickest way )

Import the trim lut file

You can find that file here :

Library/Application support/Blackmagic Design/DaVinci Resolve

Apply your grade to this shot

Go to the config page, under the LUT\'s tab and use the create grade from current grade option.

Give it a name and that will save the grade.

You should find it available under :

Library/Application Support/Blackmagic Design/DaVinci Resolve/LUT\'s

Hope this helps!

Dan Moran
Application Specialist
Blackmagic Design EMEA


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Cory JamiesonRe: Create and Export LUT for Alexa LOG Footage
by on Mar 7, 2011 at 10:38:52 pm

I'm an After effects Compositor working with Alexa Footage also. I would love to be able to bring a LUT into after effects to get an idea of the grade as I composite. Can the Davinci export the formats AE supports (".3dl and .cube")? Thanks.


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Manuel WengerRe: Create and Export LUT for Alexa LOG Footage
by on Mar 7, 2011 at 10:59:47 pm

i copied the trim_lut0.dpx which you find at
Library/Application support/Blackmagic Design/DaVinci Resolve
in the media storage directory, so i can access it faster.

Apply your grade to this file and save it as Dan described it, works fine.

If you use any other application, like Framecycler, you can export .cube files and put them into

Library/Application support/Blackmagic Design/DaVinci Resolve/LUT

There are several LUTs in there and some predefined directories,
my experience is, that the .cube files need to be put into one of the default folders to work.

Back in Davinci you need to hit the button "update lists" in the config/Luts page to get the new LUTs available.

good luck
Manuel

Manuel Wenger
DOP / DIT / Digital Colorist
Munich - Germany


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Sascha HaberRe: Create and Export LUT for Alexa LOG Footage
by on Mar 7, 2011 at 11:02:16 pm

The " off the shelf" Arri LUTs from the Lut builder are probably just much much better .
The vectors are bent in very elaborate ways to get the most out of every channel.
Be sure to make yourself a nice 64k cube as starting point and then add your secret sauce .

A slice of color...

DaVinci 7.1 OSX 10.6.6
Dual Xeon 2,4 RAM 24 GB
RAID0 8TB eSata 6TB
GTX 285 / GT 120
Extreme 3D+ WAVE


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Jay LeeRe: Create and Export LUT for Alexa LOG Footage
by on Mar 7, 2011 at 11:08:28 pm

Great.......thank you. Particularly like the 'still' work flow. Very clever.
Resolve is creating via this work flow TWO luts.

.cube

and

.cube_3dlut

Is this a 2D and 3D version?

Also Sascha what are you referring to at a "64k Cube as a starting point"?

cheers,


j


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Manuel WengerRe: Create and Export LUT for Alexa LOG Footage
by on Mar 8, 2011 at 7:54:46 am

i think Sascha is referring to the LUT you can generate yourself on the ARRI website:
http://arridigital.com/technical/luts/live

If you´re in the postproduction section you can set the dimension of the LUT cube which is max.64 per side.

Manuel Wenger
DOP / DIT / Digital Colorist
Munich - Germany


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Jay LeeRe: Create and Export LUT for Alexa LOG Footage
by on Mar 8, 2011 at 10:35:04 pm

got it....thank you.

j


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Philipp MeierRe: Create and Export LUT for Alexa LOG Footage
by on Jul 24, 2013 at 5:19:46 am

Hey guys,

Sorry to butt into this conversation but I was wondering if any of you grade Alexa footage without a LUT in resolve? I got some footage to grade and it all comes in pretty green. Doesn't matter if I apply the LUT the DIT gave me the build in LUT in Resolve.

So my current workflow is to place one empty node before the LUT, then the LUT in the next node, and all other nodes after that. Then I use the pre-LUT node to make some basic adjustments to level out the picture and neutralize the colors. I started working this way because I noticed that the sheet metal of the car started to become pretty flat when I tried to make those adjustments post-LUT.

Anyways, I was wondering if I should be using the LUT at all or if I should be doing the entire grade from scratch. Do you guys have any thoughts on that? It just seems a bit overwhelming to grade log-c material from scratch.

Thanks,

Philipp


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