# 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
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.