Carsten wrote:
> > > At the very least, it should be a negotiable process where
> > > clients can specify the result formats they can support and
> > > the thumbnailer can select from those supported formats.
> > > A fallback requirement of png or some other standard format
> > > would be reasonable. This would allow us to support jpg, mpeg,
> > > edje, or whatever format we choose, and any clients that also
> > > support those formats could benefit.
> >
> > I suppose a minimal 'standard' format for animated images
> > would be good. This is something that doesn't seem as well-
> > established as say png/jpg are for static images.. eg. things
> > like mng/mpeg don't seem too widely used by the 'major' toolkits
> > to provide say animated icons or whatnot. Animated svgs are
> > lacking as well, but even if used eventually, it's likely that
> > one may want to save 'thumbs' of them as animated raster images.
>
> mpg is very widely used - but it support no alpha channel.
> mng doesn't support lossy comrpession to the extend mpeg, xvid,
> ogg etc. do (it supports jpeg compression with alpha - that's
> about it). mng just never took off.
As it turns out though, there's a new attempt to fix many
of the 'issues' people had with the original mng format. It's being
proposed by the Mozilla project, and its main focus is to have a
simple format for obtaining animated pngs (with alpha), which they're
calling "apng".
Here's a link to their spec:
http://wiki.mozilla.org/APNG_Specification
I briefly looked at it and it does indeed seem well suited
to the goals they had in mind.
I'd brought this up briefly with Vincent a few days ago
since I was curious of the animated image format work he'd started
a bit back (I can't recall the original email where he mentions it).
Vincent had something similar in mind to Mozilla's as well,
but he'd like to use some method of further compressing the animation.
I'm sure he can be more specific for anyone who might be curious to
help him with it.. it could end up being very nice.
In any case, Mozilla's apng seems like a reasonable animated
image format for people to use right now, and I hope it'll get wide
adoption (I think the png group still wants to stick by mng, even if
essentially no one uses it). They even have some tools to create
apngs from various kinds of sources.
jose.
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