FX30 Lumetri scopes are wrong.....

[Jordan Clay]

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....

[Jordan Clay]

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

[R Neil Haugen]

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

[Jordan Clay]

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

[Jordan Clay]

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.

[Jordan Clay]

For the record it looks like 80IRE in the scopes is clipping point. And i'm trying to figure out why. Clipping point should be 100IRE not 80IRE so I absolutely cannot trust my scopes right now.

[R Neil Haugen]

Define "correctly" ... compared to what other screen or scopes? Seriously, I need to know what you're comparing to. What is the base your judgement is on?

And that's not being critical at all, just establishing the base for any discussion.

Any representation of an image on any display is an interpretation by the combined factors of that system used. And every system will display the same pixels differently. There is no 'PERFECT!" image that will magically appear the same on all systems. No two "indentical" monitors, even highly calibrated and fed from the same LUT box, will show exactly the same image. I've seen that demonstrated.

Then ... no camera has an accurate screen, not even the $70,000 Red, Sony, or Arri rigs. If they need accurate on-set viewing, they get a calibrated (and expensive) field monitor to do so. If a $70G camera doesn't have an accurate screen, why anyone expects there's to be so, I dunno.

Which is not what any of us actually expects, of course. But it is Reality.

I'd be happy to test the clip on my system if you wanted to share a link to it. See what it shows.

Neil

[Jordan Clay]

I am clipping and losing absoloutley all detail of everything above 80IRE.

[R Neil Haugen]

Does detail above 80IRE appear in another app?

[Jordan Clay]

I'm gonna check davinci standby

[R Neil Haugen]

And one thing I realize a lot of users aren't used to thinking about yet ... is the auto-tonemapping on, and if so, and you turn it off, does that change the image?

[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.

[Jordan Clay · Accepted solution]

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.

[R Neil Haugen]

There's more controls now than ever, that all interact with each other. I even struggle to remember them all, and color is my thing!

Always happy to get someone working again.