ASUS ProArt PA27AC 27-Inch WQHD HDR Professional Monitor

Discussion in 'Frontpage news' started by Hilbert Hagedoorn, Dec 22, 2017.

  1. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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  2. EJocys

    EJocys Member Guru

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    There is a reason why real HDR monitors have minimum requirement of 1000 cd/m² for monitors and 4000 cd/m² for projectors. It is because realistic mid-day scene requires 700 cd/m² and sky over 2000 cd/m². Anything less and day scenes will start to look more like like dusk or dawn. Some low quality theatres are killing 3D cinema with not enough brightness, because even mid-day bright scenes looks dark and de-colourised, because human eye is switching to monochromatic vision under low light conditions.
    Code:
    Factor
    (cd/m²)    Multiple    Value    Item
    
    ----------------- --- HDR Projector Range Start
             0 µcd/m² Ideal black body
    10^−6    1 µcd/m² Absolute threshold of vision
    10^−4  400 µcd/m² Darkest sky
    ----------------- --- OLED HDR Monitor Range Start
    10^−3    1 mcd/m² Night sky
             2 mcd/m² Typical photographic scene lit by full moon
             5 mcd/m² Approximate scotopic/mesopic threshold
    ----------------- --- LED HDR Monitor Range Start
    10^−2   40 mcd/m² Phosphorescent markings on a watch dial after 1 h in the dark
    10^0     2  cd/m² Floodlit buildings, monuments, and fountains
             5  cd/m² Approximate mesopic/photopic threshold
    10^1    25  cd/m² Typical photographic scene at sunrise or sunset
            30  cd/m² Green electroluminescent source
            55  cd/m² Standard SMPTE cinema screen luminance
            80  cd/m² Monitor white in the sRGB reference viewing environment
    10^2   250  cd/m² Peak luminance of a typical LCD monitor
    ----------------- --- OLED HDR Monitor Range End
           700  cd/m² Typical photographic scene on overcast day
    ----------------- --- LED HDR Monitor Range End
    10^3     2 Kcd/m² Average cloudy sky
             3 Kcd/m² Moon surface
             5 Kcd/m² Typical photographic scene in full sunlight
    ----------------- --- HDR Projector Range End
             7 Kcd/m² Average clear sky
    10^4    10 Kcd/m² White illuminated cloud
    ----------------- --- Human eye comfort / Hi-End HDR limit
            12 Kcd/m² Fluorescent lamp
            75 Kcd/m² Low pressure sodium-vapor lamp
    10^5   130 Kcd/m² Frosted incandescent light bulb
           600 Kcd/m² Solar disk at horizon
    10^6     7 Mcd/m² Filament of a clear incandescent lamp
    10^8   100 Mcd/m² Possible retinal damage
    10^9   1.6 Gcd/m² Solar disk at noon
    
    Luminance Source: https://en.wikipedia.org/wiki/Orders_of_magnitude_(luminance)

    Human eye experiences up to 90 000 nits (cd/m²) per day. These popular standards exists to cover this:

    * HDR10 for LED (0.05 nits black, ≥1000 nits peak, 10-bit color depth)
    * HDR10 for OLED (0.0005 nits black, ≥540 nits peak, 10-bit color depth)
    * Dolby Vision for Cinema (0 nits black, ≥4000 nits peak, 12-bit color depth)
     
    Last edited: Jan 2, 2018

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