Sony SLog3 to REC709 Which Preset LUT?

[FenlandAC]

I'm shooting Sony FS7 Slog3 XAVC CineEI.

I'm looking to get this into a starting point and looking for a LUT for this. I note there are a number of manufacture specific preset LUTs available in Speedgrade. Has anyone out there been using Sony Slog3 and can recommend a starting point LUT in order to bring my gamma footage into the REC709 world?

Regards

[R Neil Haugen]

I've seen commercially produced LUT's available for this, you'd need to search for them. Within Sg, there's the "Looks" produced by the "Lumetri engine" which are in application exactly the same as a LUT ... though they don't export to other programs. I know a number of colorists who've made their own Looks for specific cameras by simply loading test footage of a set scene or test pattern, then working their controls until they get the correct result in scopes, then saving that as a named Look for that camera.

Doesn't take much time to do once you've the hang of Sg's controls. And that can be applied either within another layer or or on a separate adjustment layer made in PrPro for a grading layer.

Neil

[RoninEdits · Accepted solution]

there are "camera patches" in the looks for speedgrade but not sure which, if any would work. i do see some luts that come with davinci resolve lite that by name seems like they are for the F5 but might work. you can install the lite version for free, get the luts from someone who has it installed, or try the ones from the link below.

C:\ProgramData\Blackmagic Design\DaVinci Resolve\Support\LUT\Sony

SLog3SGamut3.CineToCine+709.cube,  SLog3SGamut3.CineToLC-709.cube,  SLog3SGamut3.CineToLC-709TypeA.cube,  SLog3SGamut3.CineToSLog2-709.cube

there is also a post on sony's forums for what appears to be the same luts but perhaps older version.

http://community.sony.com/t5/F5-F55/Release-version-3DLUT-s-for-S-Gamut3-Cine-S-Log3/m-p/287847#U287...

Definitive SLog3.cine LUT workflow? - Sony's Community Site

[FenlandAC]

Thank you both. Yes, I am already a user of the Sony forum. Thanks for the links.

[sabian_1047]

how do i download the luts from the link

[Ann Bens]

You will have to search the site.

[R Neil Haugen]

Edit: I should ask, of course, if there's a specific reason you still want to use a LUT for normalization of Sony S-log variants. At times, of course, one is required to do so.

In general, your pixels would be safer and in better condition if you used the full mathematical transform of Premiere's algorithms rather than an old chart LUT.

Because that's all a LUT is, a chart of text. No math. Just take RGB triplicate X and change to RGB triplicate Y.

Any data not within that which the LUT was built around will get clipped or crushed. So with LUT based normalization, one should always have the ability to do tonal changes prior to the LUT to make sure the field-produced media actually isn't mangled by that LUT.

Which is why colorists in Resolve and Baselight normally include normalization LUTs in a second node or layer, apply the LUT, then go to the first node or layer to 'trim' the clip's exposure/contrast/sat "through" the LUT.

But most colorists will normally use any algorithmic transform instead of a LUT transform, unless the job specifically requires a specific LUT. 

[kubak32700890]

hello there.

DaVinci Resolve (the newest free version) has the best Slog3 and Slog2 to rec709 converting LUT I have seen so far.

Best.

K