[Octave-bug-tracker] [bug #40664] Inconsistent handling of N-dimensional RGB images

[Adam H Aitkenhead]

Follow-up Comment #1, bug #40664 (project octave):

(The example code seems to have gone missing below.  I think I messed up using
verbatim...  Here it is again.)

This patch makes ind2rgb and rgb2ind reversible for ND arrays - see the
example below for a 4D test RGB image of size 4x5x6x7, with the RGB channels
in the third dimension:


test = rand(4,5,3,6,7);
[x,m] = rgb2ind(test);
rgb = ind2rgb(x,m);
isequal(test,rgb)

ans =  1

whos

Variables in the current scope:

   Attr Name        Size                     Bytes  Class
   ==== ====        ====                     =====  ===== 
        ans         1x1                          1  logical
        m         840x3                      20160  double
        rgb         4x5x3x6x7                20160  double
        test        4x5x3x6x7                20160  double
        x           4x5x6x7                   1680  uint16



Also, there's an old discussion of this on the mailing list at:
http://octave.1599824.n4.nabble.com/ind2rgb-problem-td4653534.html#a4659386

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