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AlexxxxP
AlexxxxP
Participating Frequently
May 30, 2024
Question

RGB Gamut "Violations" Puzzle

  • May 30, 2024
  • 3 replies
  • 539 views

Can anyone help?

An automated QC program (Telestream Vidchecker) keeps flagging RGB Gamut violations (screenshot attached) on a master I've exported, and for some reason they still get flagged as violations.

 

I'm exporting a Quicktime, Apple ProRes 422HQ, 1920x1080, 25fps (progressive) master, with maximum render depth & maximum quality from Premiere Pro to Encoder (export settings screenshot below).

 

I had hoped that applying an adjustment layer & video limiter would solve the issue, but unfortunatley I haven't been successful. It's strange because if anything the footage looks undersaturated.

 

Any ideas or suggestions are greatly appriciated.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This topic has been closed for replies.

3 replies

R Neil Haugen
R Neil Haugen
Legend
May 30, 2024

I'd love to see the Waveform scope with 10-bit scale for those frames.

 

And I'm also wondering if there's a full/legal issue going on. Hmmm.

Everyone's mileage always varies ...
AlexxxxP
AlexxxxPAuthor
Participating Frequently
June 5, 2024

Hi Neil,

Thank you for your reply. Richard vd Boogaard has given me a pointer which I'd overlooked, I'm going to run some tests.

Thanks again, and I'm sorry for the delay in replying. I'm moving between different projects, as one does. 

Best, Alex

    Richard van den Boogaard
    Community Expert
    Richard van den BoogaardCommunity Expert
    Community Expert
    May 30, 2024

    Do you get identical flagging results when using one of the default export presets (e.g. HD Master Quicktime ProRes 422HQ)?

     

    Judging from the type of flag that is reported, it appears to be an issue with darker images. The range is defined as 64-255 levels and apparently it falls below the threshold on these segments in the timeline. Consider raising the levels of these segments in the color grade and see if that solves the issue.

      AlexxxxP
      AlexxxxPAuthor
      Participating Frequently
      June 5, 2024

      Ahhh, I see what you're driving at. That's a good point. I automatically assumed that it was flagging levels that were too high. Thank you, Richard, I'll run some tests. 

       

      PS. Apologies for the delayed reply. 

      R Neil Haugen
      R Neil Haugen
      Legend
      May 30, 2024

      @Bruce Bullis might be helpful on this. Or @mattchristensen 

      Everyone's mileage always varies ...
      Bruce Bullis
      Bruce Bullis
      Legend
      May 30, 2024

      Matt knows much more about color than I, and...I think Telestream might be the best source for info on their software's flagging decisions. We're happy to work with them, as always. 

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