Mailing List AE-List@media-motion.tv ? Message #41954
From: Brian Higgins <higgins@soldesignfx.com>
Subject: Re: [AE] Inverse a LUT?
Date: Fri, 3 Feb 2012 10:57:23 -0600
To: After Effects Mail List <AE-List@media-motion.tv>
As an addendum, all the DI guys and colorists I know generally don't mess with LUTs on the input end at all...they yank the image around until it looks the way they want. 

-b

On Fri, Feb 3, 2012 at 10:55 AM, Brian Higgins <higgins@soldesignfx.com> wrote:
If you're just using it as a one-light kinda thing while you comp, do you really have to use an uber-accurate LUT?  Why not just make a reversible 1D LUT that doesn't crush blacks or clip highlights?   The "official" Arri LogC2Video lut is a mild S-curve.  I'd just make an adjustment/guide layer, add a Curves effect, make an S-curve and go to town, then turn it off before rendering.

$.02,
Brian


--
brian higgins | senior vfx artist
Sol  Design



On Fri, Feb 3, 2012 at 10:25 AM, Byron Nash <byronnash@gmail.com> wrote:
It's a 3D LUT Simon. If I try to reverse it on the Arri site, it gives me a 1D LUT. But I haven't figured out how to utilize the 1D properly. It gives a LUT for each ISO I think. 


On Fri, Feb 3, 2012 at 4:29 AM, Simon Björk <simon@stillerstudios.se> wrote:
Correct me if I'm wrong, but isn't the color operation done with a logC to rec709 a 1D lut?


2012/2/3 Brendan Bolles <brendan@fnordware.com>
On Feb 2, 2012, at 7:45 PM, Brian Maffitt wrote:

> Curious if this problem will go away with digital projection? Eventually digital projectors should be able to represent any visible color, I should think.


Any visible color, as in the entire gamut of the human eye?  We're a long way off from that, I'm afraid.  Projectors are still making images by shining red, green, and blue light up there, so that's a major constraint.  But you'd think they'd be able show everything we can see on a computer monitor at least.  Maybe they can.

Ironically, part of the forthcoming IIC/ACES standard is the "Reference Rendering Transform", which is like a standardized film look.  And like other film looks, you can't get fully-saturated colors.  Similarly, I worked on the most recent "A Christmas Carol" which is a completely digital film (including projection), and yet we still created a film look for it.  Somebody thinks that people still like that film look.  But I assume with digital projection you can opt out if you want.


Brendan


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--
brian higgins | senior vfx artist
Sol  Design



 
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