Re: GraphicsMagick gives wrong output when converting GIF to PNG

On Fri, 26 May 2017, Caio Freitas de Oliveira wrote:

> Hello,
>
> I've searched GM's website & SourceForge repository for where to report a
> bug, but haven't found any link for that, so this email is my last option.

Bugs may be reported via the SourceForge page at 
https://sourceforge.net/p/graphicsmagick/bugs/.  I think that you will 
log into your SourceForge account and use the "Create Ticket" button 
on that page.

It is wise to verify that the problem occurs with the current release 
since we can't fix old releases.

> I have found a specific GIF image that when applied a simple conversion to
> PNG, GM gives the wrong result.
>
> Source: http://i.imgur.com/02eIOgg.gif
>
> Result: http://i.imgur.com/noTbA09.png
>
> When I add any parameter, the output given by GM is correct even if the
> parameter doesn't change anything about the image. I do not know whether it
> is a problem with any lib GM's using or a problem within GraphicsMagick
> itself.

I would guess that the image will be ok if you write to any other 
format and that the issue is related to the PNG writer.

What version of GraphicsMagick are you using?

Bob
-- 
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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