---
title: Reduction Filters
framework: coreimage
role: collectionGroup
role_heading: API Collection
path: coreimage/reduction-filters
---

# Reduction Filters

Create statistical information about an image.

## Topics

### Filters

- [areaAverage()](coreimage/cifilter-swift.class/areaaverage().md)
- [areaHistogram()](coreimage/cifilter-swift.class/areahistogram().md)
- [areaLogarithmicHistogram()](coreimage/cifilter-swift.class/arealogarithmichistogram().md)
- [areaMaximum()](coreimage/cifilter-swift.class/areamaximum().md)
- [areaMaximumAlpha()](coreimage/cifilter-swift.class/areamaximumalpha().md)
- [areaMinimum()](coreimage/cifilter-swift.class/areaminimum().md)
- [areaMinimumAlpha()](coreimage/cifilter-swift.class/areaminimumalpha().md)
- [areaMinMax()](coreimage/cifilter-swift.class/areaminmax().md)
- [areaMinMaxRed()](coreimage/cifilter-swift.class/areaminmaxred().md)
- [columnAverage()](coreimage/cifilter-swift.class/columnaverage().md)
- [histogramDisplay()](coreimage/cifilter-swift.class/histogramdisplay().md)
- [kMeans()](coreimage/cifilter-swift.class/kmeans().md)
- [rowAverage()](coreimage/cifilter-swift.class/rowaverage().md)

### Protocols

- [CIAreaAverage](coreimage/ciareaaverage.md)
- [CIAreaHistogram](coreimage/ciareahistogram.md)
- [CIAreaLogarithmicHistogram](coreimage/ciarealogarithmichistogram.md)
- [CIAreaMaximum](coreimage/ciareamaximum.md)
- [CIAreaMaximumAlpha](coreimage/ciareamaximumalpha.md)
- [CIAreaMinMax](coreimage/ciareaminmax.md)
- [CIAreaMinMaxRed](coreimage/ciareaminmaxred.md)
- [CIAreaMinimum](coreimage/ciareaminimum.md)
- [CIAreaMinimumAlpha](coreimage/ciareaminimumalpha.md)
- [CIAreaReductionFilter](coreimage/ciareareductionfilter.md)
- [CIColumnAverage](coreimage/cicolumnaverage.md)
- [CIHistogramDisplay](coreimage/cihistogramdisplay.md)
- [CIKMeans](coreimage/cikmeans.md)
- [CIRowAverage](coreimage/cirowaverage.md)

## See Also

### Filter Catalog

- [Blur Filters](coreimage/blur-filters.md)
- [Color Adjustment Filters](coreimage/color-adjustment-filters.md)
- [Color Effect Filters](coreimage/color-effect-filters.md)
- [Composite Operations](coreimage/composite-operations.md)
- [Convolution Filters](coreimage/convolution-filters.md)
- [Distortion Filters](coreimage/distortion-filters.md)
- [Generator Filters](coreimage/generator-filters.md)
- [Geometry Adjustment Filters](coreimage/geometry-adjustment-filters.md)
- [Gradient Filters](coreimage/gradient-filters.md)
- [Halftone Effect Filters](coreimage/halftone-effect-filters.md)
- [Sharpening Filters](coreimage/sharpening-filters.md)
- [Stylizing Filters](coreimage/stylizing-filters.md)
- [Tile Effect Filters](coreimage/tile-effect-filters.md)
- [Transition Filters](coreimage/transition-filters.md)