uint322colcode - convert from uint32 to colcode array
FORMAT: outarray = uint322colcode(inarray)
Input fields:
inarray Nx1 (or 1xN) input array of type uint32
Output fields:
outarray Nx4 double array
(n, 1) = color index or NaN
(n, 2) = red component (0...255)
(n, 3) = green component (0...255)
(n, 4) = blue component (0...255)
See also colcode2uint32
For performance reasons, BrainVoyager supports both index based coloring (e.g. two-color curvature information, or for painting/cutting during flattening) *and* RGB coloring. To store both kinds of information in a separable way, 3 bytes per vertex would not have been sufficient.
Internally, any RGB colored vertex is stored with hexadecimal 0x3f prefix (which resembles single-precision floating point numbers in the range between 0.5 and 2). Index based colors are stored with a prefix of 0x00. Currently, alpha information is not supported (per vertex).