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Retinex
Retinex filtering is based on Land’s theory of image perception, proposed to explain the perceived colour constancy of objects under varying illumination conditions. Several approaches exist to implement the retinex principles, among these the multiscale retinex with colour restoration algorithm (MSRCR) combines colour constancy with local contrast enhancement so images are rendered similarly to how human vision is believed to operate.
Usage
Level
specifies distribution of the Gaussian blurring kernel sizes for Scale division values > 2:
Uniform
tends to treat all image intensities similarly,
Low
enhances dark regions of the image,
High
enhances the bright regions of the image.
Scale
specifies the depth of the retinex effect.
Scale division
specifies the number of iterations of the multiscale filter. Values larger than 2 exploit the “multiscale” nature of the algorithm.
Dynamic
adjusts the colour of the result. Large values produce less saturated images..
Example
Original: 
After Retinex (default parameters): 
Homepage
Please find the original page for the Retinex plugin here.
