---
title: preExposure
framework: metalfx
role: symbol
role_heading: Instance Property
path: metalfx/mtlfxtemporalscalerbase/preexposure
---

# preExposure

A pre-exposure value this scaler evaluates.

## Declaration

```swift
var preExposure: Float { get set }
```

## Discussion

Discussion If the input color texture you assign to colorTexture is pre-multiplied by fixed value, set this property to that same fixed value so MetalFX divides input color by it. This is not a common situation and you typically don’t need to assign a value to this property.