Bob Crantz wrote:
The reason it's called "chromolescence" is that the
original work was done for color images, which is a 7 vector space and then
reduced to black and white images which are a 4 vector space. Just search
Rabiner, Gold, Oppenhiem, Schafer and Tribolet.

Thanks Bob, all is clear now.

Hallelujah, in colour.

Marty