[Octave-bug-tracker] [bug #47115] label2rgb from image-package doesn't work for labels with value above the uint16 limit

[Hartmut]

Follow-up Comment #6, bug #47115 (project octave):

When running the "example code" from comment #0 in Matlab, then I do NOT get
an error. The result is of class uint8 and the values are 255 everywhere, and
at position (1,1) the value is (128,0,0). I get the same Matlab result, when I
use uint32(lw) as input for label2rgb.

In the Matlab documentation for label2rgb they say that "The input label
matrix L can have any numeric class.  It must contain finite, nonnegative
integers. The output of label2rgb is of class uint8."

In the Matlab documentation for ind2rgb they say that "[The input] X can be of
class uint8, uint16, or double. [The output] RGB is an m-by-n-by-3 array of
class double."

Conclusion: The class support of (core) Octave's ind2rgb seems to be Matlab
compatible. But the class support of (image packag's) label2rgb seems to NOT
be Matlab compatible, currently.

We could still do "better" than Matlab and also support uint32 in ind2x.m
(called from ind2rgb.m) if this doesn't harm any other function that also uses
ind2x.m.

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