---
title: kCGImagePropertyDNGBlackLevel
framework: imageio
role: symbol
role_heading: Global Variable
path: imageio/kcgimagepropertydngblacklevel
---

# kCGImagePropertyDNGBlackLevel

The zero light encoding level, specified as a repeating pattern.

## Declaration

```swift
let kCGImagePropertyDNGBlackLevel: CFString
```

## See Also

### Color Calibration

- [kCGImagePropertyDNGBlackLevelRepeatDim](imageio/kcgimagepropertydngblacklevelrepeatdim.md)
- [kCGImagePropertyDNGBlackLevelDeltaH](imageio/kcgimagepropertydngblackleveldeltah.md)
- [kCGImagePropertyDNGBlackLevelDeltaV](imageio/kcgimagepropertydngblackleveldeltav.md)
- [kCGImagePropertyDNGWhiteLevel](imageio/kcgimagepropertydngwhitelevel.md)
- [kCGImagePropertyDNGCalibrationIlluminant1](imageio/kcgimagepropertydngcalibrationilluminant1.md)
- [kCGImagePropertyDNGCalibrationIlluminant2](imageio/kcgimagepropertydngcalibrationilluminant2.md)
- [kCGImagePropertyDNGColorMatrix1](imageio/kcgimagepropertydngcolormatrix1.md)
- [kCGImagePropertyDNGColorMatrix2](imageio/kcgimagepropertydngcolormatrix2.md)
- [kCGImagePropertyDNGCameraCalibration1](imageio/kcgimagepropertydngcameracalibration1.md)
- [kCGImagePropertyDNGCameraCalibration2](imageio/kcgimagepropertydngcameracalibration2.md)
- [kCGImagePropertyDNGReductionMatrix1](imageio/kcgimagepropertydngreductionmatrix1.md)
- [kCGImagePropertyDNGReductionMatrix2](imageio/kcgimagepropertydngreductionmatrix2.md)
- [kCGImagePropertyDNGAsShotICCProfile](imageio/kcgimagepropertydngasshoticcprofile.md)
- [kCGImagePropertyDNGAsShotPreProfileMatrix](imageio/kcgimagepropertydngasshotpreprofilematrix.md)
- [kCGImagePropertyDNGCurrentICCProfile](imageio/kcgimagepropertydngcurrenticcprofile.md)