see http://www.argyllcms.com/doc/profile.html:
"In order to generate perceptual and saturation intent B2A tables, it is
necessary to specify at least one profile to define what source gamut
should be used in the source to destination gamut mapping. The -S
parameter is used to do this, and doing so causes perceptual and
saturation tables to be generated. If only a perceptual intent is
needed, then the -s flag can be used, and the saturation intent will use
the same table as the perceptual intent."
Klaus
