[Octave-bug-tracker] [bug #37681] imread function when used with indexed images returns a matrix with 0 values, that are not accepted by other image funcs

[Carnë Draug]

Follow-up Comment #1, bug #37681 (project octave):

The range of values for indexed images is dependent on their class and this
may be the origin for confusion. If the indexed image is of an integer class,
their indexes start at 0 so there's an offset of 1 for the colormap. However,
some index images can be of class double in which case there's no offset and
the minimum index should be 1.

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