FS7: LUTCalc Update

C

cameramanben

Well-known member
Hi All,

I've just posted a major update to LUTCalc - v3.0. Quite a lot of work under the hood, and a few more visible developments.

Probably most useful is the 'Gamut Limiter'. When you go from a wide gamut like S-Gamut3.cine to Rec709 the leftover colours can lead to nasty clipping. Gamut Limiter desaturates out of bounds colours back within range. A while ago a couple of people mentioned difficulties with nasty chroma clipping on bright, saturated colours with vanilla Rec709 (e.g. high-vis jackets), and Gamut Limiter is the result. I added a Gamut Limiter tool a couple of updates back, but the tool in v3.0 is a completely new approach with new code; simpler and much more effective. The default setting should be right for most people, but for the more techie there are a bunch of options to fiddle with ;-)

The online version is up on the LUTCalc website, with more details on the changes here. macOS App and Chrome App users should get updates shortly.

As ever, the source code is up on GitHub.

If anyone finds it useful, feedback, suggestions and heads up on any problems are always useful.

Thanks,

Ben
 
Wonderful!
Really, its the best app I know!

Also, I have a question for you if you have the time for it.
Im trying to use the Impulz LUTs for a project with the fs7 in slog3 sgamut3.cine. As many have noticed these LUTs easily introduce banding and noise. My question:

Would LUTcalc be able to analyze these LUTs, change the gamma curve to LC709A and interpolate the LUTs into 64x64x64? (I think they are originaly 32x32x32 I think, which might be the problem).

I will test this as soon as I can but out and shooting for a week without my gear/computer.

Thank you!
 
Hi All,

thanks to Rainer Speidel, I've tracked down an annoying little bug in the LUTAnalyst tool in the v3.0 release. Basically a slight change in Javascript between Yosemite and El Capitan was stopping LUTs being generated from LUTAnalyst on older versions of OSX.

This didn't seem to be a problem with the online version on Chrome or Firefox.

The fix has been applied, and the App Store has just cleared it, so the v3.0.1 update should come through shortly. I've already uploaded it to the online version.

Edvard: it's a bit of a tricky one if banding is baked into a LUT. The problem is that if you up the resolution of a mesh, there is a fair chance that you will sharpen any harsh changes. Having said that, no harm in giving it a go! Just let me know how it works out. I would suggest that it would probably be worth setting the analysis mesh to 33x33x33 rather than 65x65x65, and playing around with which interpolation technique LUTAnalyst uses.

Thanks,

Ben
 
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