Equalize node — Natron 2.5.0 documentation

# Equalize node

This documentation is for version 2.0 of Equalize (net.sf.cimg.CImgEqualize).

## Description

Equalize histogram of pixel values.

To equalize image brightness only, use the HistEQCImg plugin.

Uses the ‘equalize’ function from the CImg library.

CImg is a free, open-source library distributed under the CeCILL-C (close to the GNU LGPL) or CeCILL (compatible with the GNU GPL) licenses. It can be used in commercial applications (see http://cimg.eu).

## Inputs

Input | Description | Optional
--- | --- | ---
Source |  | No
Mask |  | Yes

## Controls

Parameter / script name | Type | Default | Function
--- | --- | --- | ---
NbLevels / `nb_levels` | Integer | 4096 | Number of histogram levels used for the equalization.
Min Value / `min_value` | Double | 0 | Minimum pixel value considered for the histogram computation. All pixel values lower than min_value will not be counted.
Max Value / `max_value` | Double | 1 | Maximum pixel value considered for the histogram computation. All pixel values higher than max_value will not be counted.
(Un)premult / `premult` | Boolean | Off | Divide the image by the alpha channel before processing, and re-multiply it afterwards. Use if the input images are premultiplied.
Invert Mask / `maskInvert` | Boolean | Off | When checked, the effect is fully applied where the mask is 0.
Mix / `mix` | Double | 1 | Mix factor between the original and the transformed image.