Sixteen-season system
A further-subdivided color-analysis framework, common in Korea, that splits some of the twelve seasons even finer.
The sixteen-season system is an extension of the standard twelve-season framework that splits a handful of seasons even further, typically distinguishing a true and a more blended variant within categories that the twelve-season model treats as one, or adding finer light-versus-deep and bright-versus-soft splits at the edges of the wheel. It is most closely associated with Korean personal color practice, where finer subdivision helps address the more nuanced value and undertone differences seen across a wide range of skin tones, and with some independent Western practitioners who found real clients sitting persistently between two of the twelve categories. There is no single universal sixteen-season standard the way there is for the four- and twelve-season systems; different schools draw the extra boundaries in different places, so a sixteen-season result from one practitioner does not always map cleanly onto another's terminology.
Why it matters
For people who consistently test as borderline between two of the twelve seasons, a sixteen-season reading can offer a more precise answer than forcing a single choice, though it also means comparing results across different practitioners takes noticeably more care.