Re: Why is it that png files are not dependable over the long haul

Dustin Oprea <[email protected]> Mon, 6 Aug 2018 16:52:42 -0400
Newsgroups gmane.comp.graphics.png.devel
Message-ID <CAOr1xOGewNw-VFv9S=zjTz2JhC-H5LmeqE9yZOFSUFoe-syo=Q@mail.gmail.com>
Yeah, but, for the sake of your images, I'd consider writing them back out
into some stable, standard format.

- If this option keeps the write window as the default, you should
theoretically just read then write them, and your images will be fixed.
- If not the above, then maybe you can somehow tweak the reading window to
be the size you need and the output window to be the default size with the
help of this list.
- If not the above, then encode and save the raw bytes, revert the hack,
and then re-read the raw bytes, decode, and write them as once-again happy,
conformant PNGs.



Dustin

On Mon, Aug 6, 2018, 16:16 Ruben Safir <ruben-v1XHP5QhJixWk0Htik3J/[email protected]> wrote:

> On 08/06/2018 02:20 PM, Dustin Oprea wrote:
> > The issue that you're having has existed for one month fourteen years
> ago.
> > Next year, it'll be fifteen years. In five years, it'll be about twenty
> > since it happened. It's in the distant past by this point. Unfortunately,
> > you were negatively affected by it. Unfortunately, not many others were.
> > Unfortunately, it's not a quick fix.
> >
> > If you need to tweak libpng's behavior, just clone it, modify it, build
> it,
> > and keep it separate from the system version. No need for it to get
> > complicated.
>
>
> I see.  So these options cause a break in libpng's behavior from the
> sepecification, but allow me to render these images.
>
> I can rerender them then and forget about this happening again.
>
>
>
> --
> So many immigrant groups have swept through our town
> that Brooklyn, like Atlantis, reaches mythological
> proportions in the mind of the world - RI Safir 1998
> http://www.mrbrklyn.com
> DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
>
> http://www.nylxs.com - Leadership Development in Free Software
> http://www.brooklyn-living.com
>
> Being so tracked is for FARM ANIMALS and and extermination camps,
> but incompatible with living as a free human being. -RI Safir 2013
>
>
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