The use of an Interim Connection Space (ICS) is proposed as a means for extending the concept of device independent color management to support spectral imaging. Color management, in its standard practice, relates color rendering capability of devices through a Profile Connection Space (PCS). The International Color Consortium (ICC) defines a set of encodings for PCS derivable from CIEXYZ. Multi-channel imaging systems where the goal is the reproduction of image spectra cannot use a colorimetrically-based PCS. The obvious solution is to use a new PCS based on spectral reflectance, transmittance or radiance. In the presence of a spectral PCS, though, a straightforward analog to the typical ICC color processing approach breaks down due to the likely high dimensionality of a the new PCS. To alleviate such problems the ICS is introduced as a standard dimensionally reduced image processing stage. Eigenvectors were rejected as candidate bases for ICS. Pseudoprimaries were introduced as potential ICS bases.
Mitchell R. Rosen, Noboru Ohta, "Spectral Color Processing using an Interim Connection Space" in Proc. IS&T 11th Color and Imaging Conf., 2003, pp 187 - 192, https://doi.org/10.2352/CIC.2003.11.1.art00033