| Sub-Black Levels | |
| Display Text | Sub-Black Levels |
| Description | “Sub-Black Levels” describes measured setup video level falling below the baseline, as visible on a waveform scope. |
| Impact | Sub-Black levels can result in color that appears unnatural or misrepresented. Sub-black levels typically indicate a Full/Legal range conversion issue. |
| Severity Assessment Guidance | |
| FYI | N/A |
| Issue | Black levels dip below baseline 0mV (SDR) or 0 nits (HDR). |
| Blocker | N/A |
| Solutions | |
| How to Prevent | Monitor levels using waveform and/or histogram scopes. |
| How to Fix | Any sub-black levels must be adjusted to at least baseline, as this is most likely a Full/Legal range conversion issue. |