Re: [Gimp-developer] Animation choices

On 15 August 2012 10:17, Ragnar Brynjúlfsson <ragtag ragtag net> wrote:
> Why not use mng instead of apng. mng is, as far as I know, officially
> supported by libpng and doesn't require any patching. They basically
> do the same thing, just in a slightly different way.

I think this discussion has surfaced before, around here (or maybe it was at
Python's imaging library) - and the conclusion of the thread was somewhat along
".apng is a hack, .mng is the right way to do it".

However, it looks like .apng  has got much more support "on the wild", and is
much simpler to implement correctly than the full specification of .mng.

GIMP can save basic .mng animations, but is miles from a full
conforming implementation
(I think it minds more for reading than for writing). I don't think
anyone would oppose
to have a patch to support .apng loading and saving now (if that does
not require a
modified pnglib, that is).

(In  a realted note: I just saw that my system's ImageMagick does
support .mng and does not support .apng -
I was about to suggest Nik a workflow consisting of creating .mng's in GIMP and
converting them to .apng with ImageMagick in the meantime)


> On Wed, Aug 15, 2012 at 2:32 PM, Simon Budig <simon budig de> wrote:
>> Alexandre Prokoudine (alexandre prokoudine gmail com) wrote:
>>> On Wed, Aug 15, 2012 at 11:53 AM, Nik Omul wrote:
>>> > Question 1. Why apng isn't an officially supported file format?
>>> My guess is that we just never evaluated it.
>> apparently there is a plugin for it:
>> And it apparently needs a patched libpng. Which is not going to fly with
>> the standard gimp distribution.
>> Unless someone figures out how to use the unpatched png library (or
>> implements the apng plugin by hand) I see no way how to deal with this
>> properly.
>> Bye,
>>         Simon
>> --
>>               simon budig de    
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