The name of this thread is VERY deceptive. 10.4 is NOT supported. 10.5.5 is required. If you want to play around using 10.4 then there is nothing stopping you from installing, but expect strangeness, crashes, and non-functioning tools.
"Skin Tone Tool" is very powerful, BUT not for what they advertise it for. This tool allows you to do a gray balance based on any known color rather than ONLY on a gray card. If you are constantly changing color temperatures with a particular subject (i.e. walking a model/subject tungsten, then daylight, then shadow, then strong color cast from a painted wall) then you can correct any one of those images (e.g. the daylight shot) and then "pick up" either the skin tone, or more realistically an article of clothing like a pair of jeans and then just click the equivalent color in the other shots and it will correct each shot's WB to make that color the same in each shot.
The effectiveness of the "Skin Tone Tool" will vary based on how consistent the tone of skin is on your model and on how accurately you can judge which skin tone should be used based on their relatively arbitrary names. It's not going to give you the final WB exactly, but in a tough/changing/dynamic lighting situations with hundreds of shots it lets you get rough WBs very quickly without a gray card.
For studio shooters of course you're still going to primarily use "5500/0" (or whatever known/fixed WB your aesthetics lead you towards) or a gray card. So this tool is not for you.
This also does NOT alter the skin tone, its just adjusts WB and Tint. There are included portrait ICC profiles for P1 backs as well as a full implementation of the incredibly powerful Color Editor which lets you alter and save ICC profiles (or just keep modification instructions them without having to save a new ICC profile) which can be used to design your own "skin tones". The belief that one camera produces "better skin tones" is based on each manufacturers ICC profiles and how closely their (relatively arbitrary) decisions match any particular photographers aesthetics. Phase One has its portrait profile, but with literally a few minutes of work you can produce your own profile which pushes skin tones more towards magenta, olive, higher or lower saturation and higher or lower luminosity.
We're working very hard here to produce a supplemental to the included User's Manual with our own summary of tips/tricks/shortcuts and workflow methods based on our user's input.
Anyone who downloads it and just dismisses it saying "I don't like it" needs to realize that this is a new program and ANY new program which is sufficiently different from what you are used to will garner a negative feeling. Just spend a little while with it and I really truly believe you will come to find it a powerful, flexible, and fast tool.
Doug Peterson, Head of Technical Services
Capture Integration, Phase One DealerPersonal Portfolio