png image scrambled

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The attached png image is not displayed correctly, and I am trying
to find out the cause of this.

I am not a png expert.  I ran into this because GNU Emacs (that uses
libpng) does not display this image as expected, unlike other
applications including eog and imagemagick.

Then I built the test program rpng.  It displays this image in the
same scrambled way as emacs.  Is this due to a corrupted image (that
other applications handle more graciously) or is this a bug in libpng?

Thanks.


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