These images are the result of filtering with a Hurlbert regularization filter, then biasing to gray. A relaxation was then applied, taking into account edges in luminance to constrain the color diffusion within regions belonging to a single surface.

Two dimensional histograms of the corrected images are available: chromaticity and Red vs. Blue

Illuminant A	Illuminant B	Illuminant C

• Gamma = 1
• Beta = 0.3
• sigma = 20
• Lambda = 10

Here are is the ideal frequency response, and the spatial response, of the filter.

And here is the actual frequency response of the filter.