---
title: kCGImagePropertyDNGSubTileBlockSize
framework: imageio
role: symbol
role_heading: Global Variable
path: imageio/kcgimagepropertydngsubtileblocksize
---

# kCGImagePropertyDNGSubTileBlockSize

The size of rectangular blocks that tiles use to group pixels.

## Declaration

```swift
let kCGImagePropertyDNGSubTileBlockSize: CFString
```

## See Also

### Image File Data

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