Peak source

[boohboot]

What is the difference between histogram, max-scl, and max-scl-luminance? In what cases should I use each of them and what is the most accurate option to specify static hdr metadata?

[quietvoid]

You could've found the info using hdr10plus_tool plot --help:

  -p, --peak-source <PEAK_SOURCE>
          How to extract the peak brightness for the metadata

          Possible values:
          - histogram:         The max value from the histogram measurements
          - histogram99:       The last percentile in the histogram, usually 99.98% brightness percentile
          - max-scl:           The max value in `maxscl`
          - max-scl-luminance: The luminance calculated from the `maxscl` components Assumed BT.2020 primaries
          
          [default: histogram]

I recommend to simply leave it to the default.