---
title: histogramDisplay()
framework: coreimage
role: symbol
role_heading: Type Method
path: coreimage/cifilter-swift.class/histogramdisplay()
---

# histogramDisplay()

Generates a histogram map from the image.

## Declaration

```swift
class func histogramDisplay() -> any CIFilter & CIHistogramDisplay
```

## Return Value

Return Value The generated image.

## Discussion

Discussion This method applies the histogram display filter to the result of the output from the areaHistogram() filter. This effect shows a graphical representation of the tonal distribution of colors in the image. The histogram display filter uses the following properties: The following code creates a filter that results in a histogram diagram generated from the input image: func areaHistogram(inputImage: CIImage) -> CIImage {     let filter = CIFilter.areaHistogram()     filter.inputImage = inputImage     filter.count = 256     filter.scale = 50     filter.extent = CGRect(         x: inputImage.extent.width/2-250,         y: inputImage.extent.height/2-250,         width: 500,         height: 500)     return filter.outputImage! }

func histogramDisplay(inputImage: CIImage) -> CIImage {     let filter = CIFilter.histogramDisplay()     filter.inputImage = areaHistogram(inputImage: inputImage)     filter.highLimit = 1     filter.height = 100     filter.lowLimit = 0     return filter.outputImage! }

## See Also

### 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)
- [kMeans()](coreimage/cifilter-swift.class/kmeans().md)
- [rowAverage()](coreimage/cifilter-swift.class/rowaverage().md)