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Color correlated temperature: fallback strategy for non supported cameras ?

Submitted by aquaticmatt on

Hi,
I am using libraw to access cam_xyz and cam_mul to compute the Color correlated temp and tint of an image.
When the RAW comes from a non supported camera, cam_xyz is a matrix filled with zeros.
Is there a recommended way to fallback on cam_xyz values coming from a different but similar cameras (same brand, earlier models) and compute an approximate value rather than returning some default temp and tint.

Thanks

Matt

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