---
title: Vignette Reduction
slug: ncam-reality/vignette-reduction
docTags: 
createdAt: 2021-08-30T05:35:48.000Z
---

## Introduction

One of the options made available in the lens calibration interface is a **vignetting reduction** tool.

This is intended to aid the user in overcoming issues with the calibration charts being detected when there is a large amount of vignetting present on the camera feed.  This is typically seen when trying to calibrate anamorphic lenses, and is not typically an issue with most lens calibrations.

::Image[]{src="https://api.archbee.com/api/optimize/Qn0sdcVrDcDbwMFmH0oYn/JMgE7ePGwqrjjlucc39NA_vigreduc.png" size="70" width="704" height="206" position="center" showCaption="false"}

:::hint{type="info"}
Using the vignette reduction tool is not normally required for the vast majority of lens calibrations
:::

## The Tool

The vignetting reduction tool has 4 modes available to choose between:

- **None** - No vignetting reduction is applied, this is the default setting
- **Manual** - A slider is exposed to manually adjust the strength of the tool
- **Semi Automatic** - Allows a calibration step to be conducted to reduce vignetting
- **Automatic** - Automatically reduces vignetting

### Semi Automatic

Position a plain white surface in-front of the camera and ensure that it fills the entire frame.  Following this press "**capture**"

### Automatic

Simply press "**capture**" to enable the vignetting reduction