HistEQ node

This documentation is for version 2.0 of HistEQ.

Description

Equalize histogram of brightness values.

Uses the ‘equalize’ function from the CImg library on the ‘V’ channel of the HSV decomposition of the image.

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.
(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.