---
title: kCGImageAuxiliaryDataTypeHDRGainMap
framework: imageio
role: symbol
role_heading: Global Variable
path: imageio/kcgimageauxiliarydatatypehdrgainmap
---

# kCGImageAuxiliaryDataTypeHDRGainMap

The type for High Dynamic Range (HDR) gain map information.

## Declaration

```swift
let kCGImageAuxiliaryDataTypeHDRGainMap: CFString
```

## See Also

### Auxiliary Data Types

- [kCGImageAuxiliaryDataTypeDepth](imageio/kcgimageauxiliarydatatypedepth.md)
- [kCGImageAuxiliaryDataTypeDisparity](imageio/kcgimageauxiliarydatatypedisparity.md)
- [kCGImageAuxiliaryDataTypePortraitEffectsMatte](imageio/kcgimageauxiliarydatatypeportraiteffectsmatte.md)
- [kCGImageAuxiliaryDataTypeSemanticSegmentationGlassesMatte](imageio/kcgimageauxiliarydatatypesemanticsegmentationglassesmatte.md)
- [kCGImageAuxiliaryDataTypeSemanticSegmentationHairMatte](imageio/kcgimageauxiliarydatatypesemanticsegmentationhairmatte.md)
- [kCGImageAuxiliaryDataTypeSemanticSegmentationSkinMatte](imageio/kcgimageauxiliarydatatypesemanticsegmentationskinmatte.md)
- [kCGImageAuxiliaryDataTypeSemanticSegmentationSkyMatte](imageio/kcgimageauxiliarydatatypesemanticsegmentationskymatte.md)
- [kCGImageAuxiliaryDataTypeSemanticSegmentationTeethMatte](imageio/kcgimageauxiliarydatatypesemanticsegmentationteethmatte.md)