Possible to save color space transform to LUT?

Is this possible in resolve? I have used the color space transform on a node to convert red log footage to 709 but after doing so and then adjusting nodes to create a look if I then export a .cube the color space transform does not seem to carry over into the exported LUT.

Is there any way to get around this or do you have to reply on a 709 LUT added to a node?

Why would you want to do that?

A color space transform is much better, not only is it more accurate (a LUT always interpolates data) but it transfers the gamma and gamut beyond the target range, in your case Rec.709.

Red log obviously has a larger dynamic range and gamut than Rec.709. As a colorist you would not want to map this onto Rec.709 with a single 'good for all' LUT but you would want to map it based on the footage.

[quote="Cary Knoop"]Why would you want to do that? ]

If you are making a shooting LUT based on camera tests, for uploading to a set monitor etc., then it makes completely sense to do this. I agree that this is a shortcoming of Resolve.


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As well as the reasoning Oyvind suggests i also need to be able to send a LUT down the pipeline to systems not using resolve.

there are quite acceptable tools available for this tasks outside of resolve -- e.g.:

http://opencolorio.org/userguide/baking_luts.html

Thanks Martin,

Red also supply a whole series of RWG/L3G10>709 LUT's as well which is my aim here but would be nice for Resolve to do this also.

Do you happen to know of any apps off hand that can save a transform to a LUT that are a little less complex to get your head into that the one you posted above?

Do you happen to know of any apps off hand that can save a transform to a LUT that are a little less complex to get your head into that the one you posted above?

once there was a web based GUI for OpenColorIO, which did this job, but it's extremely outdated and unmaintained in the meanwhile.

LUTCalc is another simple option, which comes into mind.

and there are many more expensive professional products available for this kind of tasks:
Latice or the nuke GenerateLUT node.

but i still prefer the OpenColorIO comand line variant already mentioned, because it's a really transparent, accurate and a suitable mathematical solution, which produces more satisfaying results than most other approaches, which try to deduce LUTs from arbitrary image processing pipelines.

You can also create a lut using the trim_lut.dpx file that comes with Resolve. That way you can include the color space transform. See page 77 of the Resolve 14 manual.

Thanks both - I have lattice but didn't realise it would do this transform - I'll have a poke around. Although LUTCalc seems to be the simplest option - another tool I had forgotten about.

You can also create a lut using the trim_lut.dpx file that comes with Resolve. That way you can include the color space transform. See page 77 of the Resolve 14 manual.

All the times i used that route, the result was off. And i know whay I'm doing.

I use nuke, i tried fusion, but fusion cannot export .cube (blackmagic, what's up with that???).

What resolve need is two modes for lut creation:

Normal: behave as is.
Extended: it will try to make a lut including anything that is in the stack. The operator need to know what he/ she is doing.

Any updates with this? Is it possible now to export CST transforms to LUTS?

Any updates with this? Is it possible now to export CST transforms to LUTS?

yes. Works now

Any updates with this? Is it possible now to export CST transforms to LUTS?

It works, there some issues if you have fusion composition

Any updates with this? Is it possible now to export CST transforms to LUTS?

It works, there some issues if you have fusion composition

I found out that using fusion’s node Lut analyzer to export a lut gives a more accurate result than the regular generate lut from the color page. What are your issues with a fusion comp?

Any updates with this? Is it possible now to export CST transforms to LUTS?

It works, there some issues if you have fusion composition

I found out that using fusion’s node Lut analyzer to export a lut gives a more accurate result than the regular generate lut from the color page. What are your issues with a fusion comp?

It had something to do on an image generate in fusion that passed thru the color transform FX, if I dumped a x33 lut it worked, if i dumped a x65, it did not. (Window).

I will have to try again…

Ok, thanks Walter. I'm going to add this to my tests. I've noticed that some curves like Hue vs Sat or Lum vs Sat can transport into a 33 lut but but not very well if you push the knob too far. I was wondering if a 65 lut could help in that case. And what surprises me is that the trim lut workflow ( within fusion ) seems to be more accurate that the generate lut from the color page. I expected less steps would produce a better "mathematical" result.