4. Classification
4.1 Color Regions—The color region for a color is determined
by measuring the Hunter L, a, b color values for a
sample. Use the integer value (by truncating any fractional
results) to determine the color region for the color using the
following region boundaries.
4.1.1 Region 1—Beige:
L = 60 to 87
a = –2.5 to 4.0
b = 6.5 to 23
4.1.2 Region 2—Dark Brown:
L = 13 to 33
a = –1.0 to 6.0
b = 1.0 to 6.5
4.1.3 Region 3—Gray:
L = 33 to 74
a = –3 to 4
b = –5.5 to 5.5