How to create a LUT viewer for FCPX?

Try this:

https://fcpxtemplates.com/?sdm_process_download=1&download_id=30230

It's free (for now). Hope it helps!

It's an Effect (if you need help installing: https://fcpxtemplates.com/installing-plugins-for-fcpx/)

I was trying to find out how many at one time you were wanting to compare — I had done "four up" but I took the time to modify the template for 2, 3 and 4-up at once. The Src Offsets allow you to expose different parts of the clip per "Panel" since the main subjects are not always "dead center".

I added a Custom LUT source parameter for convenience... but the effect doesn't have to be used with LUTs — up to four separate clips can be "treated" with any kind of effects and compared together. Plus, you could also always apply the Custom LUT effect separately (but *before* the Comparitor!)

Using the Effect:

Apply to a clip. Set the Setup you want (2,3, or 4-up display).

Duplicate the clip as many times as you need.

Select which Panel to show for each duplicated clip by the Panel # option (or turning off those that don't apply for that clip).

Panel visibility can be turned on and off so if you stack more than four — you can toggle visibility of "upper" duplicates as you compare.

(You can save individual setups as Effects Presets... if that's something you use. Basically, you can change the default settings I've provided and save the custom settings as an EP.)

This is the parameter list:

This effect will work with vertical video to ultra-widescreen (and beyond). It is not recommended to "mix" aspect ratios [vertical vs. horizontal, etc.; determined by the individual clips NOT the project size!]

PS - I couldn't really test the LUT feature (but it looks to be the same as the Custom LUT effect in FCPX). I would be interested to hear how it works out you (or anyone who uses it) because, as it turns out: ***I don't have any LUTs!*** [never use them - no matter what! Not for Log/Raw or any other camera/media types.]

I apparently have my own methods nobody else is interested in...LOL. Neither LUTs or the Color Board were used with the ARRI Log C footage above (and I wasn't even going for anything accurate - just different from each other!)

I would like to create a viewer where I can try multiple different LUTs to choose the best effect to apply to a movie

I think the LUT that giuseppefromgr wants to compare is a "custom LUT". Since the question is "how to create a comparison viewer," I don't think it will be solved just by explaining the differences in LUTs.

I will explain how to compare using 4 clips (original HLG/bluish/color correction only/reddish), size FHD (1920*1080).

1. Stack the four clips vertically.

2. Slightly shift each clip. The position and crop values ​​are as follows.

You can't.

Once you apply a LUT to either a clip in the Event Browser or in the timeline, that LUT is applied to all copies of that same clip in the Library! [The clips are all changed in every project they are used in.] You will not be able to compare the appearance of two "different" LUTs for the same clip.

Now, if you can do without using LUTs (it can be done), then a comparator can be made easily enough:

I think this depends on what type of LUT we are talking about.

If this is a Camera LUT, selected directly in the Inspector, then you are right, it will affect all occurrences of the clip.

But if one could experiment using the Custom LUT effect, one could do something like your example above straight in FCP timeline.

What I was thinking of was something similar to what LocaAlicia showed. I think it is a good solution.

This might help you

https://colorfinale.com/lut-manager