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I set up the render with QuickTime, RGB, h.264 with max quality.
you are rendering H.264 through Ae? don't do that. this particular codec is old and buggy. use AME to export H.264 from Ae. Basics of rendering and exporting in After Effects CC
And I have a problem with colors after render process in AfterEffects.
how are you viewing your render? import the render back to Ae, are the colors alright? then it's alright, and it's the player that's causing the issue. also bare in mind that when compressing footage, due to the inherit chroma subsampling of H.264 (4:2:0) you are bound to lose color accuracy in many cases. not much to do about it but to render a less compressed format. you might want to try different encoders like Handbreak that produces x.264 format which is considered by many a better option than H.264.
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Simply forget it. Your colors will never look consistent. That's inherent in video and how different systems treat Gamma. As Roei said, encoding H.264 using the legacy QT methods doesn't help, either, and well, to point out the most obvious flaw in your whole workflow: None of this matters if you are not working with color management and calibration. Your whole workflow simply doesn't make any sense. If at all, you would have to encode different videos for different platforms and even then you better make sure they are reasonably color neutral and your video uses an excellent compression that doesn't screw your colors too much...
Your simplest workaround would be to tweak the brightness and contrast of the video in the Sketch and Principle app, if it allows it.
If there are no colour controls for video in that app, screenshot the colour discrepancy as a reference, bring it into After Effects and create an Adjustment Layer to compensate for it, and then export that version.
I used your screenshot as a reference and saved out a Curves preset that you can try using. Apply a Curves effect to your background (or an Adjustment Layer above the whole timeline), and then import the file from the Effects Panel.
Thank You, Mylenium.
Can You, please, advice me what color management and calibration tools do you use? Or is this not tool? Maybe do you have some tips for this workflow?
I`m very thankful!!
Sorry for this issue. Did you ever find a solution? Please let us know if you have or if you still need help.