---
title: boostShadowAmount
framework: coreimage
role: symbol
role_heading: Instance Property
path: coreimage/cirawfilter/boostshadowamount
---

# boostShadowAmount

A value that indicates the amount to boost the shadow areas of the image.

## Declaration

```swift
var boostShadowAmount: Float { get set }
```

## Discussion

Discussion Use this value to lighten details in shadows. The value should be in the range of 0...2. The default value is 1. A value less than 1 darkens the shadows, and a value greater than 1 lightens the shadows. note: Setting this value has no effect if the boostAmount is 0.

## See Also

### Configuring a filter

- [baselineExposure](coreimage/cirawfilter/baselineexposure.md)
- [boostAmount](coreimage/cirawfilter/boostamount.md)
- [colorNoiseReductionAmount](coreimage/cirawfilter/colornoisereductionamount.md)
- [contrastAmount](coreimage/cirawfilter/contrastamount.md)
- [decoderVersion](coreimage/cirawfilter/decoderversion.md)
- [detailAmount](coreimage/cirawfilter/detailamount.md)
- [exposure](coreimage/cirawfilter/exposure.md)
- [extendedDynamicRangeAmount](coreimage/cirawfilter/extendeddynamicrangeamount.md)
- [isDraftModeEnabled](coreimage/cirawfilter/isdraftmodeenabled.md)
- [isGamutMappingEnabled](coreimage/cirawfilter/isgamutmappingenabled.md)
- [isLensCorrectionEnabled](coreimage/cirawfilter/islenscorrectionenabled.md)
- [linearSpaceFilter](coreimage/cirawfilter/linearspacefilter.md)
- [localToneMapAmount](coreimage/cirawfilter/localtonemapamount.md)
- [luminanceNoiseReductionAmount](coreimage/cirawfilter/luminancenoisereductionamount.md)
- [moireReductionAmount](coreimage/cirawfilter/moirereductionamount.md)