Is there any easy way to bypass input LUT on export?

Forum|Forum|1 year ago
June 17, 2024
1 reply
1926 views

When I export small clips for VFX work, I'd prefer to export these without the input LUT enabled.

There are basically two ways I can achieve this right now:

Right click the source clips and disable input LUT, then export, then re-enable.

Or use an adjustment layer that I can turn on or off. This is easier, but seems to perform worse, especially if I'm making adjustments to the motion of the original clip, and sometimes doesn't work as well if the source is HDR.

I'd prefer for there to be an option during export to bypass input LUTs.

I'd also like an option for the project to have a default input LUT as well, rather than needing to set it up for every input source.

I believe these are things you can do in Resolve, but I can't seem to find easy ways to achieve these things in Premiere.

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R Neil Haugen

Legend

What Input LUTs are you choosing to use? Premiere doesn't have them as such. The new color management system relies on tonemapping (an algorithmic process) rather than LUTs for log media.

So it sounds like you are applying a LUT ... ?

Everyone's mileage always varies ...

morphinapgAuthor

Inspiring

Right click source, click Modify -> Color. Add Input LUT in this screen:

I generate my own LUTs. Do my own color space conversions and tonemapping, incorporating my own grading, rather than just standard color management. I have one LUT for SDR output, and a different LUT for HDR output.

R Neil Haugen

Legend

No, I export the same sequence, one with the SDR LUT attached, and one with the HDR LUT attached, so it's the same clips both times because it's the same sequence.

When I export for VFX, I don't want any LUT attached.

All of my LUTs are custom designed to work with the specific footage in each project, including custom clipping levels, adjustments to contrast, tonemapping, color handling, all that. My LUTs are generated using some custom math from measurements I make, designed to not be destructive with any of this footage, so that's not an issue. The source footage is PQ/2020 HDR, but I use my LUTs to create a custom tonemap to SDR, as well as a custom modified look for the HDR as well. I interpret as rec709 when I'm previewing my SDR LUT, and I interpret as PQ2020 when I'm previewing my HDR LUT. For exporting VFX, I export as rec709 with no lut and modify the color space in premiere later.

While I can attach the LUT in the export preset, that would mean I would have to edit with the LUT disabled, which I don't want to do. I want to see the footage as my viewers will see it while I'm editing.

Resolve does have a way to do this. While editing I can set it as a monitor-only LUT, like this:

And while exporting I could set it as either an input or output LUT, depending on how I wanted to use it. This is applied project wide, which would be super useful in Premiere too.

Like I said, in premiere I could also use an adjustment layer with the LUT on it, and simply turn on or off that layer as necessary. This is easy, but it has performance issues when I need to make other adjustments to the clips it's affecting. It makes motion adjustments a lot slower than using Input LUTs, and it also sometimes is less accurate with HDR LUTs.

Fascinating process there!

And it's complicated and unique enough that I'm not sure where the Fx send comes in your process. So it's not easy to guess how to handle your initial request of the thread.

Everyone's mileage always varies ...

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