Calculates segment classification measures as defined in Endler (1990).
(required) quantum catch color data. Can be either the
vismodel() or independently calculated data (in the form of a
data frame with columns named 'S1', 'S2', 'S3', 'S4', and, optionally,
'lum', representing a generic 'tetrachromatic' viewer).
A data frame of class
colspace consisting of the following columns:
S4: the relative reflectance at each of the four
MS: segment scores
B: 'chroma', 'hue' (degrees), and 'brightness' in the segment
Endler, J. A. (1990) On the measurement and classification of colour in studies of animal colour patterns. Biological Journal of the Linnean Society, 41, 315-352.