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Is there any approximation to convert between Hunter Lab (illuminant C, 10 degree observer) and CIELAB (illuminant D65, 10 degree observer)?

April 26, 2017approximation CIELAB convert degree illuminant Observer

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Is there any approximation to convert between Hunter Lab (illuminant C, 10 degree observer) and CIELAB (illuminant D65, 10 degree observer)?

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There is no unique solution since there are many spectra that can produce a given set of colorimetric coordinates (metamerism). You could make a rough approximation by using the inverse HunterLab equations to convert back to XYZ tristimulus values and then compute the CIELAB values for them (perhaps just using Ill. C since it is close to D65 and this will be only an approximation).