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# VNInstanceMaskObservation

An observation that contains an instance mask that labels instances in the mask.

```
class VNInstanceMaskObservation
```

## Topics

### Accessing Instances

[`allInstances`](/documentation/Vision/VNInstanceMaskObservation/allInstances)

The collection that contains all instances, excluding the background.

[`instanceMask`](/documentation/Vision/VNInstanceMaskObservation/instanceMask)

The resulting mask that represents all instances.

### Creating a Mask

[`generateMask(forInstances:)`](/documentation/Vision/VNInstanceMaskObservation/generateMask(forInstances:))

Creates a low-resolution mask from the instances you specify.

[`generateMaskedImage(ofInstances:from:croppedToInstancesExtent:)`](/documentation/Vision/VNInstanceMaskObservation/generateMaskedImage(ofInstances:from:croppedToInstancesExtent:))

Creates a high-resolution image where everything becomes transparent black, except for the instances you specify.

[`generateScaledMaskForImage(forInstances:from:)`](/documentation/Vision/VNInstanceMaskObservation/generateScaledMaskForImage(forInstances:from:))

Creates a high-resolution mask where everything becomes transparent black, except for the instances you specify.


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