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AE CS5 to AlexaLogCv3 dpx

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Doug Appleton
AE CS5 to AlexaLogCv3 dpx
on May 4, 2013 at 4:36:38 am

Hey all, I'm having a problem that I can't seem to figure out. I'm working in AE CS5 and the client is asking that we deliver AlexaLogcV3 DPX files. I've used DPX files in the past but I'm not familiar with AlexaLogcV3 and can't find a whole lot of information about it. Does anyone have any ideas? Thanks!


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Angelo Lorenzo
Re: AE CS5 to AlexaLogCv3 dpx
on May 4, 2013 at 7:45:17 am

Are you delivering video or titles or what?

Alexa footage's native color space is LogC. If you aren't doing any color correction and anything composited into a LogC image should also be considered LogC.

http://www.arri.com/camera/digital_cameras/tools/lut_generator/lut_generato... Go to advanced, select video as your input and set destination to logC if you've done titles or something that is more difficult to match. LUT should get you most of the way there.

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Angelo Lorenzo

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Doug Appleton
Re: AE CS5 to AlexaLogCv3 dpx
on May 4, 2013 at 2:05:11 pm

Thanks for the quick reply!

All content was generated originally in AE with default settings. We are not compositing anything into footage. I generated a LUT from the Arri site and it made my project look washed out. Then I applied the LUT provided to us to bring the footage back to how they will view it and it didn't match up. Would a solution be to apply the LUT from the Arri site first, then adjust levels so when we apply the LUT provided that it matches closer? Thanks for the help!


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Angelo Lorenzo
Re: AE CS5 to AlexaLogCv3 dpx
on May 4, 2013 at 6:59:00 pm

What are you doing for these people? Titles? Full frame content? Or plates/overlays that someone else will composite?

Lets assume you're titles or whatever you're working on look good on your monitor. It's Rec 709 (my assumption as very few people work with a P3 monitor).

You use the LogC LUT to brink your work to near the same curve/color response as Arri LogC footage. It will look washed out

Don't worry about a transform back matching, these transforms are fairly destructive.

Generally, this transformation is requested on material that will be composited. If this is material like title cards.... makes me think the Producer is taking a shortcut and will just slap a single look?LUT over the entire program and call it a day.

--------------------
Angelo Lorenzo

Need to encode ProRes on your Windows PC?
Introducing ProRes Helper, an awesome little app that makes it possible
Fallen Empire Digital Production Services - Los Angeles
RED transcoding, on-set DIT, and RED Epic rental services
Fallen Empire - The Blog
A blog dedicated to filmmaking, the RED workflow, and DIT tips and tricks
Can your post production question fit in a tweet? Follow me on Twitter


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Angelo Lorenzo
Re: AE CS5 to AlexaLogCv3 dpx
on May 4, 2013 at 7:01:56 pm

http://thepostlab.com/pitch-perfect-takes-advantage-of-a-dci-p3-color-workf... This is additional reading.

Color space is basically an arbitrary mapping of the color values in a file. If it looks good on a Rec 709 monitor then it's in Rec 709 space. If it looks good on top of LogC footage, then it's LogC space. LUTS are just transforms that get you 90% of the way there.

--------------------
Angelo Lorenzo

Need to encode ProRes on your Windows PC?
Introducing ProRes Helper, an awesome little app that makes it possible
Fallen Empire Digital Production Services - Los Angeles
RED transcoding, on-set DIT, and RED Epic rental services
Fallen Empire - The Blog
A blog dedicated to filmmaking, the RED workflow, and DIT tips and tricks
Can your post production question fit in a tweet? Follow me on Twitter


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Doug Appleton
Re: AE CS5 to AlexaLogCv3 dpx
on May 5, 2013 at 12:55:07 pm

Thanks for the reply!

We're creating title cards so all content is created by us. We aren't using any footage at all. Just to make sure I understand correctly, I apply the LUT to bring my color into LogC and make adjustments so that when I apply their LUT it looks right. Then I should just be able to give them a render without their LUT on and it'll work?


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Angelo Lorenzo
Re: AE CS5 to AlexaLogCv3 dpx
on May 5, 2013 at 9:24:11 pm

That would work, correct. The longC conversion is "burned in" with small adjustments as needed.

--------------------
Angelo Lorenzo

Need to encode ProRes on your Windows PC?
Introducing ProRes Helper, an awesome little app that makes it possible
Fallen Empire Digital Production Services - Los Angeles
RED transcoding, on-set DIT, and RED Epic rental services
Fallen Empire - The Blog
A blog dedicated to filmmaking, the RED workflow, and DIT tips and tricks
Can your post production question fit in a tweet? Follow me on Twitter


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