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

[Hartmut]

Follow-up Comment #1, bug #47115 (project octave):

The Octave file ind2x.m has currently (image repo) an explicit test for only
the two integer classes uint8 and uint16:


  ## Check if X is an indexed image.
  ## An indexed image is defined has having only 2D, and that's how Matlab
  ## behaves.  But we want to support ND images, so we will allow up to 4D
  ## and check that the 3rd dimension is a singleton.
  if (all (ndims (x) != [2 4]) || size (x, 3) != 1
      || iscomplex (x) || issparse (x)
      || (isfloat (x) && x != fix (x))
      || ! any (strcmp (class (x), {"uint8", "uint16", "single", "double"})))
    error ("%s: X must be an indexed image", caller);
  endif


Maybe we can change this to allow also uint32 and uint64 integers? Or would
this harm any other user of this helper function?

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