Re: png image scrambled

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Even if Emacs agrees with it?



Dustin

On Fri, Aug 23, 2019, 12:57 Bob Friesenhahn <[email protected]
wrote:

> On Fri, 23 Aug 2019, Roland Winkler wrote:
>
> > 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.
>
> Are you saying that eog and imagemagick appear to display the image
> correctly?  I looked at it with GraphicsMagick and it does not look
> "scrambled", although the image is very tiny so it is difficult to
> look at without magifying it.
>
> > 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?
>
> The probability that this is due to a bug in libpng is exceedingly low
> since it likely has a billion users.
>
> It may be that there is a problem with how the test program was
> compiled and linked.
>
> Bob
> --
> Bob Friesenhahn
> [email protected], http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
> Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt
>
>
> _______________________________________________
> png-mng-misc mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/png-mng-misc
>

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<div dir=3D"auto">Even if Emacs agrees with it?<div dir=3D"auto"><br></div>=
<div dir=3D"auto"><br></div><div dir=3D"auto"><br></div><div dir=3D"auto">D=
ustin</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Fri, Au=
g 23, 2019, 12:57 Bob Friesenhahn &lt;<a href=3D"mailto:[email protected]=
las.tx.us">[email protected]</a> wrote:<br></div><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex">On Fri, 23 Aug 2019, Roland Winkler wrote:<br>
<br>
&gt; The attached png image is not displayed correctly, and I am trying<br>
&gt; to find out the cause of this.<br>
&gt;<br>
&gt; I am not a png expert.=C2=A0 I ran into this because GNU Emacs (that u=
ses<br>
&gt; libpng) does not display this image as expected, unlike other<br>
&gt; applications including eog and imagemagick.<br>
<br>
Are you saying that eog and imagemagick appear to display the image <br>
correctly?=C2=A0 I looked at it with GraphicsMagick and it does not look <b=
r>
&quot;scrambled&quot;, although the image is very tiny so it is difficult t=
o <br>
look at without magifying it.<br>
<br>
&gt; Then I built the test program rpng.=C2=A0 It displays this image in th=
e<br>
&gt; same scrambled way as emacs.=C2=A0 Is this due to a corrupted image (t=
hat<br>
&gt; other applications handle more graciously) or is this a bug in libpng?=
<br>
<br>
The probability that this is due to a bug in libpng is exceedingly low <br>
since it likely has a billion users.<br>
<br>
It may be that there is a problem with how the test program was <br>
compiled and linked.<br>
<br>
Bob<br>
-- <br>
Bob Friesenhahn<br>
<a href=3D"mailto:[email protected]" target=3D"_blank" rel=3D"no=
referrer">[email protected]</a>, <a href=3D"http://www.simplesys=
tems.org/users/bfriesen/" rel=3D"noreferrer noreferrer" target=3D"_blank">h=
ttp://www.simplesystems.org/users/bfriesen/</a><br>
GraphicsMagick Maintainer,=C2=A0 =C2=A0 <a href=3D"http://www.GraphicsMagic=
k.org/" rel=3D"noreferrer noreferrer" target=3D"_blank">http://www.Graphics=
Magick.org/</a><br>
Public Key,=C2=A0 =C2=A0 =C2=A0<a href=3D"http://www.simplesystems.org/user=
s/bfriesen/public-key.txt" rel=3D"noreferrer noreferrer" target=3D"_blank">=
http://www.simplesystems.org/users/bfriesen/public-key.txt</a><br>
<br>
<br>
_______________________________________________<br>
png-mng-misc mailing list<br>
<a href=3D"mailto:[email protected]" target=3D"_blank" rel=
=3D"noreferrer">[email protected]</a><br>
<a href=3D"https://lists.sourceforge.net/lists/listinfo/png-mng-misc" rel=
=3D"noreferrer noreferrer" target=3D"_blank">https://lists.sourceforge.net/=
lists/listinfo/png-mng-misc</a><br>
</blockquote></div>

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