I'm using Argyll_V1.1.0_RC1_osx10.4_i86 and the gamut mapping isn't working properly for me when building RGB to CMYK device link profiles.
Everything works as expected until either -g or -G are used. The results are not any better when using source image gamuts either.
There is a loss of saturation immediately noticeable throughout the resulting images.
Images which are highly saturated -- the seaside sunset image in Bill Atkinson's Lab Target for instance -- will not give an acceptable result if any type of gamut mapping is used.
Profiles built using identical methods in 1.0.4 and 1.0.3 behaved as expected. -- Martin Orpen Idea Digital Imaging Ltd