[Octave-bug-tracker] [bug #29359] file created with imwrite dowesn't match original data.

[Rik]

Follow-up Comment #13, bug #29359 (project octave):

It's still unclear exactly where the error resides.  As I wrote before, using
GraphicsMagick 1.3.5 I see no difference between the image read in and the
image read out.  I used the test script attached to this bug report and the
'compare' function from GraphicsMagick.


For the two images that you uploaded:
gm compare -metric mse pickoutcentralin.tif pickoutcentralout.tif
Image Difference (MeanSquaredError):
           Normalized    Absolute
          ============  ==========
     Red: 0.0000076567        0.0
   Green: 0.0000076567        0.0
    Blue: 0.0000076567        0.0
   Total: 0.0000076567        0.0

And there is a difference.  After running the test script with Octave 3.2.3
and generating a new out.tif image.

Image Difference (MeanSquaredError):
           Normalized    Absolute
          ============  ==========
     Red: 0.0000000000        0.0
   Green: 0.0000000000        0.0
    Blue: 0.0000000000        0.0
   Total: 0.0000000000        0.0



As JWE suggested, if there is a sample piece of code showing how to
read/write an image we can compare that implementation against the one in
Octave.

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