bug#37153: 26.1; some png images scrambled

[Eli Zaretskii]

> Date: Thu, 22 Aug 2019 23:49:00 -0500
> From: "Roland Winkler" <winkler@gnu.org>
> 
> put attached file into ~/picture.png
> start emacs -Q
> evaluate
> (insert-image (create-image "~/picture.png"))
> The image is scrambled.  With imagemagick the image displays correctly
> (insert-image (create-image "~/picture.png" 'imagemagick))
> Of course, not all png images are scrambled.  So it seems to be a bug
> that is triggered only by certain png images.

Are you sure this is not a libpng bug?