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Jordan Clay
Inspiring
July 8, 2023
Answered

FX30 Lumetri scopes are wrong.....

  • July 8, 2023
  • 2 replies
  • 2674 views

Shooting with FX30 s-cinetone rec 709. The lumetri scopes are definetly completely wrong. This is Rec-709 footage straight out of the camera so it shouldnt need a LUT nor CST but the footage looks like its being interpreted wrong in Premiere and the scopes are definietly wrong....

This topic has been closed for replies.
Correct answer Jordan Clay

Just as I suspected. Clipping point in Davinci is 100IRE like it supposed to be. And in Premiere its 80IRE. The scopes are off by 20IRE. I cannot use the scopes on Premiere as they are wrong. This means LUTS and color correction could be wrong as well if the clips are being interpreted wrong....I have posted both pics from both premiere and davinci.


I found out what is was. For some reason the sequence settings color space was set to REC 2100 HLG :/..... My clips are Rec 709 and this threw everything off. Never changed it to HLG so not sure why the settings would just do that. I would not have found this without your help Niel from checking the "Auto tone mapping button" it was right above that thanks.

2 replies

R Neil Haugen
R Neil Haugen
Legend
July 8, 2023

I work for/with/teach pro coloristst. So I've needed to run a tight viewing situation, with a correct grey wall behing the monitor, exact measured amount of back or 'difference' light at correct colot temp, in a room with exact color temp and overall ... dim-ness. And a well calibrated and profiled monitor.

 

I've done a lot of running clips between Premiere, Resolve, and Omniscope. That's a high-end external scope application, fed from the working transmit out to its own monitor.

 

From that I'm quite comfortable saying the Lumetri scopes are actually pretty darn close. As in, within a couple IRE nearly anywhere on anything.

 

So I'd be willing to bet if I had that clip in-house, and brought it up in Resolve with Omniscope running, I'd see a similar trace.

 

Which has me curious why you're sure that should be higher than the 80-ish it is? Which is actually nice, as you've got some headroom to adjust highlights as you want without clipping. Were you running zebras or something while shooting?

 

Neil

Everyone's mileage always varies ...
J
Jordan ClayAuthor
Inspiring
July 8, 2023

I understand what you are saying. However that isnt 80IRE its white hot. I went up to 90IRE just so you can see everything is clipping at 90IRE. The clips are all looking like they are overexposed when the scopes say they should be max80 IRE

J
Jordan ClayAuthor
Inspiring
July 8, 2023

The scopes arent off by a little they are off by a MILE. And I don't understand. These are Rec 709 S-Cine straight from an FX30. These shouldnt need any CST or Interpretation to show correctly....Something is going wrong and it looks like Premiere's scopes are saying the clipping point is at 80IRE instead of 100IRE.

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Jordan ClayAuthor
Inspiring
July 8, 2023

The circled portion is no where near 80 IRE....It should be close to/clipping point ~100IRE....what is the issue

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