Video Electro-Optical Transfer Functions
      
    Introduction
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    Encoding verses decoding & Viewing conditions
    
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    Log-Log plots
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    perceptual errors -  DE2000 1 DE lines plotted on a log-log
    graph 
    "Pure Gamma" curves
    
    They don't exist, unless your display has a perfect, zero black. But
    even if it does have a perfect black, the black as seen by your eye
    won't be perfect unless you are in a pitch black room and the
    display is all black, because any stray light in the room or from
    other non-black elements on the display will dilute the perfect
    black due to glare.
    
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    Output Offset Black
    Input Offset Black
    
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    BT.1886
    
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