---
title: kIOVideoFeatureControlClassIDBlackLevel
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.12+]
path: kernel/1646200-anonymous/kiovideofeaturecontrolclassidblacklevel
---

# kIOVideoFeatureControlClassIDBlackLevel

## Declaration

```occ
kIOVideoFeatureControlClassIDBlackLevel = 'bklv'
```

## Discussion

Discussion A IOVideoFeatureControl that controls the black level offset. The units for the control's absolute value are percetage (%).