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For once in my life, I've been handed an edit job that is shot in such a way that I can grade the whole thing in one pass with a LUT.

On this particular edit, I need to first use a Log conversion LUT, and then can apply the additional grade LUT. I'd like to do this with Adjustment Layers to facilitate easier revisions (rather than clip-level effects).

What is the correct order of rendering with regards to adjustment layers? If I put each LUT on a different layer, which is applied first?

My searching revealed no answers; apologies if my underslept brain has missed an obvious one.

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I'm fairly certain that Premiere Pro renders all layers from bottom to top. I have found several sources that confirm this behaviour for After Effects, but nowhere is it stated explicitly for Premiere Pro.

From the Adobe documentation for After Effects:

A composition consists of layers stacked on top of one another in the Timeline panel. When the composition is rendered—either for previewing or for final output—the bottom layer is rendered first. Within each raster (non-vector) layer, elements are applied in the following order: masks, effects, transformations, and layer styles. For continuously rasterized vector layers, the default rendering order is masks, followed by transformations, and then effects.

Source

Rendering layers from bottom to top is also the logical order. If it was the other way around, blending modes and certain other effects couldn't function properly. Let's say I have two video layers, the upper one being set to multiply as it's blending mode. This blending mode takes into account the pixels of the video layer below it. This wouldn't work if that layer hadn't been rendered yet.

So I would suggest this layer order for your timeline:

Adjustment Layer with color grading effects
--------------
Adjustment Layer with color correction effects
--------------
Layer with video clips 

Alternatively, you could just put all your LUT effects on the same adjustment layer. Keep in mind that effects on a clip are rendered top to bottom. So if you have just one adjustment layer that holds one LUT effect for color correction and another one for color grading, make sure the color correction effect is on top in the Effect Settings panel.

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    Shouldn't it be bottom-to-top? – Gyan Nov 27 '16 at 14:05
  • @Mulvya ehem ... yes. My bad ^^' – MoritzLost Nov 27 '16 at 14:07
  • One more thing: "make sure the color grading effect is on top" --> bottom, right? – Gyan Nov 27 '16 at 15:15
  • @Mulvya indeed. Guess I utterly confused OP. Sorry :p – MoritzLost Nov 27 '16 at 16:28
  • I'm fairly certain it doesn't matter from a rendering perspective. Say you have a simple lut that makes e everything more blue. Then you have another effect that adds more contrast. The lut is just mapping values from a certain 'level' to another, while the contrast is just adding to that. Whether ones on top or ones below it doesn't matter, they are both 'flattened' during render. The only reason you might want your minor color temp and exposure changes to be made before is to match clips or adjust so the lut looks good. But if everything's homogeneous it doesn't matter. – Alex Dec 18 '16 at 3:24
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If your LUT is applied to the footage files as a filter within the project (and it shows up in your Effects Controls Window Pane; order will matter, and you will want it at the TOP.

PPro prioritizes from Top to Bottom for Effects.

If you can apply your LUT to the footage outside of PPro, where it actually writes to the clips metadata which Premiere would then interpret, then you don't need to add it in PPro; but you should still do the LUT process first.

Use your LUT to color correct your footage to "Primary". Then use your color correction effects to get the look you want once all your footage is graded to match.

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