---
title: typeDescriptor
framework: Application Services
role: symbol
role_heading: Instance Property
platforms: [macOS 10.0+]
path: applicationservices/cmvideocardgammatype/1560647-typedescriptor
---

# typeDescriptor

The signature type for a video card gamma tag. There is currently only one type possible, `cmSigVideoCardGammaType`.

## Declaration

```occ
OSType typeDescriptor;
```