[Octave-bug-tracker] [bug #32986] imread() reads .png with alpha channel as an unexpected array format

[Carnë Draug]

Follow-up Comment #10, bug #32986 (project octave):

With both your cases I get an uint8 matrix of 512*512*3, an empty colormap
(class double), and a uint8 matrix of 512*512 for the alpha channel.

I have attached what imread is currently reading (it's in Octave binary
format). Could you take a look and see if they match what you would expect?
The image seems to match what GIMP shows, but I'm unsure about the alpha
channel.


octave> [a1, b1, c1] = imread ("alpha.png" );
octave> [a2, b2, c2] = imread ("alpha2.png" );
octave> whos
Variables in the current scope:

   Attr Name        Size                     Bytes  Class
   ==== ====        ====                     =====  ===== 
        a1        512x512x3                 786432  uint8
        a2        512x512x3                 786432  uint8
        b1          0x0                          0  double
        b2          0x0                          0  double
        c1        512x512                   262144  uint8
        c2        512x512                   262144  uint8



(file #28720)
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Additional Item Attachment:

File name: alpha_test.mat.tar.xz          Size:220 KB


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