Alexa in After Effects color questions

Hello, I work with DPX files in After Effects CS6 (Mountain Lion) which are located in the color space of Alexa Log C without intermediate color grading or direct treatment of Technicolor.  My problem is the following: I am trying to correct the color files DPX to match Avid DNxHD quicktimes reference class color that were genereted from the same files to DPX using a LUT and a CDL.  In the past, that I never did NOT match perfectly using LEVELS by adjusting the color in each layer of color individually while comparing it to the color clip, I am corresponding to.  Not only it is impossible to match the DPXs made from the raw images Alexa to a color version of this clip which is corrected DNxHD quicktime format, but I find the red channel in the DPX files behave in ways that are unlike anything I've ever worked with before.  I did extensive research regarding this issue without success.  Technicolor provided a LUT for NUKE and SHAKE that, as well as a CDL, is supposed to recreate the color of the quicktimes grade.  I used free Colorista enter the CDL values, but also the READ buddy to incorporate the LUT that was given to me with no luck.  Compensation with levels does not work because the red channel will NOT cooperate.  I also used the utility LUT in After Effects, with the same results.  I even contacted the person in charge of such things at Technicolor and they admitted that they gave up on After Effects with regard to a solution of color corresponding to sequences of Alexa that has been converted to Avid DNxHD and baked with a LUT and CDL.  I can't be the first person to be executed on this issue and that it SHOULD be a solution that doesn't involve switching to Nuke.  Anyone?


See this for more information on using the ARRI Alexa film colors in After Effects:

After Effects and Alexa - part 1 by ChrisZwar

Tags: After Effects

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