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

# kIOVideoFeatureControlClassIDContrast

## Declaration

```occ
kIOVideoFeatureControlClassIDContrast = 'ctst'
```

## Discussion

Discussion A IOVideoFeatureControl that controls a the distance bewtween the whitest whites and blackest blacks. The units for the control's absolute value are percentage (%).