> 10000cd/m2
なんて言ったって、これが現実

BT.2408 "nominal recommendations"

TABLE 1 "Nominal signal levels for PQ and HLG production"
Reflectance Object or Reference      Nominal Luminance,cd/m2  Nominal Signal Level
   (Luminance Factor,%)           (PQ & 1000cd/m2HLG)     %PQ   %HLG
    Grey Card(18%)                     26            38    38
  Greyscale Chart Max(83%)               162            56    71
 Greyscale Chart Max(90%)                179            57    73
Reference Level: HDR Reference White
(100%) also diffuse white and Graphics White     203            58    75

TABLE 2 "Preliminary signal levels for common objects in PQ and HLG production"
Reflectance Object  Nominal Luminance cd/m2   Signal Level
               (PQ & 1 000 cd/m 2 HLG)   %PQ  %HLG
  Skin Tones          Vary by region      Vary by region
   Grass               30-65         39-47 40-55
  Ice Rink               155            55   71
 White Objects           140-425         54-66 69-87