Encoding 4K HDR

[TGB]

The skin tone in HDR movies looks different when I downscale from 4K to 1080p. The skin tone is even in the original and has some gray spots in the encode. any ideas on how to improve this?

Samples
Original



Downscaled to 1080p



The original it's HEVC 10bit at 91.2 Mb/s

HDR data

Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : BT.2020
Mastering display luminance : min: 0.0001 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 325 cd/m2
Maximum Frame-Average Light Level : 169 cd/m2

Encoded with Handbrake using HEVC 10bit at 14 Mb/s (2pass slow)

HDR data

Color range : Limited
Color primaries : BT.2020
Transfer characteristics : PQ
Matrix coefficients : BT.2020 non-constant
Mastering display color primaries : BT.2020
Mastering display luminance : min: 0.0001 cd/m2, max: 1000 cd/m2
Maximum Content Light Level : 325
MaxCLL_Original : 325 cd/m2
Maximum Frame-Average Light Level : 169
MaxFALL_Original : 169 cd/m2

[Selur]

https://forum.doom9.org/showthread.php?p=2009295