[Octave-bug-tracker] [bug #50797] uint8 RGB images trigger conversion error

[Rik]

Follow-up Comment #2, bug #50797 (project octave):

I get the same behavior reported error on the dev branch as well.

The actual error is generated in libinterp/octave-value/ov-intx.h.


  Matrix
  matrix_value (bool = false) const
  {
    Matrix retval;
    dim_vector dv = dims ();
    if (dv.ndims () > 2)
      error ("invalid conversion of %s to Matrix", type_name ().c_str ());

    retval = Matrix (dv(0), dv(1));
    double *vec = retval.fortran_vec ();
    octave_idx_type nel = matrix.numel ();
    for (octave_idx_type i = 0; i < nel; i++)
      vec[i] = matrix(i).double_value ();

    return retval;
  }


Somewhere in the code we are using object.matrix_value ().  The issue is
probably that the code expects to see a 2-D color data matrix at that point
rather than a 3-D RGB value.  I'm not sure whether the conversion is expected
to happen in C++ or in the m-file image.m.


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