---
title: kCGImagePropertyDNGBackwardVersion
framework: imageio
role: symbol
role_heading: Global Variable
path: imageio/kcgimagepropertydngbackwardversion
---

# kCGImagePropertyDNGBackwardVersion

The oldest version for which a file is compatible.

## Declaration

```swift
let kCGImagePropertyDNGBackwardVersion: CFString
```

## See Also

### Image File Data

- [kCGImagePropertyDNGPrivateData](imageio/kcgimagepropertydngprivatedata.md)
- [kCGImagePropertyDNGMakerNoteSafety](imageio/kcgimagepropertydngmakernotesafety.md)
- [kCGImagePropertyDNGRawDataUniqueID](imageio/kcgimagepropertydngrawdatauniqueid.md)
- [kCGImagePropertyDNGSubTileBlockSize](imageio/kcgimagepropertydngsubtileblocksize.md)
- [kCGImagePropertyDNGRowInterleaveFactor](imageio/kcgimagepropertydngrowinterleavefactor.md)
- [kCGImagePropertyDNGVersion](imageio/kcgimagepropertydngversion.md)