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 |
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Here are is the ideal frequency response, and the spatial response, of the filter.
And here is the actual frequency response of the filter.