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# kvImageConvert_OrderedGaussianBlue

A constant that indicates the conversion will distribute the noise according to a Gaussian distribution.

```
var kvImageConvert_OrderedGaussianBlue: UInt32 { get }
```

## Discussion

The following shows an 8-bit RGB image converted to a 1-bit planar image with [`vImageConvert_Planar8toPlanar1(_:_:_:_:_:)`](/documentation/Accelerate/vImageConvert_Planar8toPlanar1(_:_:_:_:_:)) using [`kvImageConvert_DitherOrderedReproducible`](/documentation/Accelerate/kvImageConvert_DitherOrderedReproducible). The image on the left uses [`kvImageConvert_OrderedGaussianBlue`](/documentation/Accelerate/kvImageConvert_OrderedGaussianBlue), and the image on the right uses [`kvImageConvert_OrderedUniformBlue`](/documentation/Accelerate/kvImageConvert_OrderedUniformBlue):

![Photos showing images with different noise distributions applied during dithering.](images/com.apple.accelerate/media-3358020@2x.png)

To learn about converting an RGB image to grayscale, see <doc://com.apple.documentation/documentation/Accelerate/converting-color-images-to-grayscale>.

---

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