-
Alexa LUT Applied Wrong?
I am working with some Alexa Log C footage. I think I may have made a mistake when I applied the LUT. Instead of on a node, I applied it on the Config page under the Display Lookup Table pulldown. When I render, it looks like the LUT wasn’t applied to the render.
I tried changing the config page LUT settings to default and then I put the Alexa Log C to Rec 709 LUT on node one of some of my corrections. It doesn’t look quite the same, but it’s hard to compare.
Is this a good solution or am I screwed. I graded all day using the display setup, but not my corrections…HELP!!!!
Robert Due
Editor / Colorist
INDEPENDENT EDIT -
7 Replies
-
Actually, I figured it out. I turned off the Display LUT option and changed the Output Lookup Table to the Alexa LUT. Seems to work.
But it would still be nice to hear if that workflow has flaws or not….
Robert Due
Editor / Colorist
INDEPENDENT EDIT -
Hey Robert,
We can figure this out.
A display LUT applies the LUT to the viewer output so you can grade with the LUT turned on but it’s not applied to your Render. Not the best for your situation but great when using Print Emulation LUT’s for Film out etc…
An Output LUT is basicly the same as above but it Does apply it to your Render.
So the quickest way to get it to look exactly the same as before is to use the Output LUT option.
If you were getting different looks by having the LUT on node one you may need to put it on the last node in the tree to get the same look.
I normally ad my LUT to the second node of the Tree. I find its the easiest as if I need to make changes to the original LOG image I can pop back to Node 1 and if not I can grade away happily from Node 2.
I hope this helps!
D
Dan Moran
DaVinci Application Specialist
Blackmagic Design EMEA -
Thanks for the reply. I was freaking out for a little bit there. In the future, I will follow your suggested work flow.
Thanks again!
Robert Due
Editor / Colorist
INDEPENDENT EDIT -
>I normally ad my LUT to the second node of the Tree. I find its the easiest as if I need to make changes to >the original LOG image I can pop back to Node 1 and if not I can grade away happily from Node 2.
Maybe I’m reading this incorrectly, but in my experience, the LUT is the last item in the processing path for each node. So if you grade on the node that applies the LUT, you’re still grading prior to the LUT.
I do exactly what you do, but I use a 3 node tree, with the first being the pre-LUT correction, the second simply applying the LUT, and the third being the first post-LUT correction. Any secondary isolations should be done in later nodes to make use of the additional contrast and saturation after the LUT application.
BTW, it’s very refreshing to read a post here by someone who actually understands what log files are, what LUTs are for, and how to set up a proper processing path for grading log format originals.
-
Hey Mike,
Sorry I actually grade from a 3rd node normally I just ment to say from node 2 onward you can grade as “normal” in a normalised space. I think it was just a bit to late my time for my brain to function normally.
Thanks for the kind words! Color Science was my worst area initially but I’ve spent a lot of time focusing / pestering DI houses and making sure I can learn as much as possible about the new advancements such as ACES etc..
Thanks!
D
Dan Moran
DaVinci Application Specialist
Blackmagic Design EMEA -
Of course, it would all be even more flexible (and accurate) if Blackmagic would add a log grading toolset to Resolve……. ;-))
-
Baby steps Mike, baby steps:-)
Right now I’ll settle for keyframing of HSL curves or copy grades to multiple events…
Reply to this Discussion! Login or Sign Up