colcode2uint32 - convert from colcode to uint32 array
FORMAT: outarray = colcode2uint32(inarray)
Input fields:
inarray Nx4 input array of type colcolde
(n, 1) = color index or NaN
(n, 2) = red component (0...255)
(n, 3) = green component (0...255)
(n, 4) = blue component (0...255)
Output fields:
outarray Nx1 uint32 array
See also uint322colcode
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).