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Error Code:

Sub-Black Levels


“Sub-Black Levels” can be used to describe measured setup video level falling below baseline.  


Sub-Black levels impact the Technical and Content Quality of the asset.  Member experience is negatively affected by color that appears unnatural or misrepresented.  Sub-black levels may also indicate a Full/Legal range conversion issue. 

Severity Structure:




Black levels dip below baseline 700mV (SDR) or 0 nits (HDR).

How to Prevent:

Monitor levels using waveform scopes.


Any sub-black levels must be adjusted to at least baseline, as this is most likely a Full/ Legal range conversion issue.


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