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Multi-channel (either multi-modality or multi-spectral) has become increasingly interesting in many areas like medical imaging, remote sensing, photography and geophysics to name just a few. A standard approach is to treat the channels separately but as there is an expected correlation between the channels it became popular to treat them jointly. The channels can be coupled by a prior that takes the structure of the scenery / anatomy / geology into account. In this minisymposium we bring together several researchers to present recent theoretical and computational advances in the area of multi-channel imaging and structural priors.