---
title: logTransferFunction
framework: corevideo
role: symbol
role_heading: Type Property
path: corevideo/cvimagebufferattachmentkeydefinitions/logtransferfunction
---

# logTransferFunction

Indicates that the transfer function or gamma of the content is a log format and identifies the specific log curve.

## Declaration

```swift
static var logTransferFunction: CVAttachmentKeyDefinition<Self.ShouldPropagate, CVImageLogTransferFunction> { get }
```