ProfileMaker 5 Handling of Near Blacks

Although it’s a great profile editor, I don’t think the PM editor can be used for this level of precision. Hopefully i1Profiler will improve on this process, because I can’t think of a perfect solution for you right now.

There’s a little more information on this in a post from a few years ago:
[one.imports.literateforums.com/t/profilemaker-5-gammut-mapping/542/1)