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Summary
Zebras are written in code values, here’s a quick chart that will help you convert between 8-bit, 10-bit and IRE levels:
| 8-bit | 10-bit | IRE |
| 0 | 0 | |
| 32 | 128 | |
| 64 | 256 | |
| 96 | 384 | |
| 128 | 512 | |
| 160 | 640 | |
| 180 | 720 | 75 |
| 191 | 764 | 80 |
| 202 | 808 | 85 |
| 213 | 852 | 90 |
| 224 | 896 | 95 |
| 235 | 940 | 100 |
| 248 | 992 | 105 |
| 255 | 1023 | 109 |
These values hold true for all Picture Controls, even N-log.
The three important values are:
- 255 or 109 IRE – to check for clipping highlights
- 180 or 75 IRE – for skin tones in all picture controls and N-Log. Reduce exposure until this zebra vanishes.
- 202 or 85 IRE – upper threshold value for skin tones. Reduce exposure until this zebra vanishes for specular highlights.