Tip #1472: FCP: Problems Chroma-Keying HDR Media

… for Apple Final Cut Pro X

Tip #1472: FCP: Problems Chroma-Keying HDR Media

Larry Jordan – LarryJordan.com

This problem doesn’t have a workaround, yet.

The results of keying HDR HLG media in Final Cut Pro.

Topic $TipTopic

Brandon brought this issue to my attention.

There seems to be a problem chroma-keying HDR green screen footage that was shot on an iPhone 12 using HEVC 10-bit HLG.  I’m running Apple Final Cut Pro 10.5.2 on macOS Catalina.

NOTE: This problem also occurs in FCP 10.5.1.

The source clip is 4K, 10-bit, HEVC HDR HLG.

When imported into FCP, and the Keyer filter is applied, what results is illustrated in the screen shot.

  • The background is green.
  • His shirt is blue.
  • His face is Caucasian.

Sampling the green background, tweaking color selection and adjusting any other setting has no effect on the results. There seems to be no way for the system to separate green values from any other color.

I don’t have a workaround, yet. I’ve notified Apple and will let you know what I find out.

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3 replies
  1. Merrick Dupea
    Merrick Dupea says:

    How about nesting the clip in a compound clip, perhaps with a minor filter applied like a gamma change, then keying the compound clip?

    That might force it to prerender each individual frame upstream from the keyer.


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