---
title: digest
framework: coreimage
role: symbol
role_heading: Instance Property
path: coreimage/ciimageprocessorinput/digest
---

# digest

A 64-bit digest that uniquely describes the contents of the input to a processor.

## Declaration

```swift
var digest: UInt64 { get }
```

## Discussion

Discussion This digest will change if the graph of the input changes in any way.

## See Also

### Instance Properties

- [roiTileCount](coreimage/ciimageprocessorinput/roitilecount.md)
- [roiTileIndex](coreimage/ciimageprocessorinput/roitileindex.md)