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stig olsen
Log to lin
on Oct 8, 2017 at 10:47:47 pm

Hi guys.

I would like to know what is the best method to work with log footage (alexa, red etc) in After Effects. I would like to work in linear but output back to log (same image) for color grading.

Thanks in advance,
Stig


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Chris Wright
Re: Log to lin
on Oct 9, 2017 at 1:26:32 am
Last Edited By Chris Wright on Oct 9, 2017 at 6:23:58 am

one word. opencolorio from aces.

http://fnordware.blogspot.com/2012/05/opencolorio-for-after-effects.html

The general how-to is separated in three steps:
1. Converting logC data to linear data
2. Data preview using a Rec709-viewing-LUT", composite in linear as adjustment layer or guide layer at top.
3. convert linear back to logC after compositing.

if not using color management, you can put the viewer lut on the very top as an adjustment layer as it won't affect the final composite(AE renders bottom to top) note: disable it prior to rendering or use guide layer. Finally, export as EXR half float AP0 2065. example: http://generalspecialist.com/vfx-behind-akta-manniskor/


if grading in resolve, render cgi 16 bit linear float AP0 2065 EXR master plates in ACEScg. if you render cgi in rec. 709, you're clipping all your gamut colors before you even composite! you use rec 709 as viewer RRT luts, not compositing colorspace. See Step #3 VFX Magic, Step #4 Importing & Refining The Grade below.
https://mixinglight.com/color-tutorial/getting-to-know-aces-part-3/

keep in mind, premiere doesn't support arri wide gamut directly. once you import your graded footage from resolve back into premiere, it will lose any work you did if you graded higher than rec. 709 in resolve. i.e. wide gamut, rec. 2020, p3, etc. All your work will be color clipped and show artifacts. So, if grading in a large colorspace, finish editing in resolve, there's no going back.

get your log to linear and log to rec 709 viewing luts here.
http://www.arri.com/camera/alexa/tools/lut_generator/lut_generator/


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