From: John B. <joh...@gm...> - 2013-06-27 23:46:55
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On Thu, Jun 27, 2013 at 4:25 PM, <gl...@co...> wrote: > APNG was designed to not be recognized as such. They are recognized > as regular PNGs with some unrecognized ignorable ancillary chunks. > That's the same as AGIF, in fact recognizing an AGIF is much harder than recognizing an APNG, but I suspect Google are just looking for the Netscape 'loop' marker, which comes at the start. Google could also look for acTL in PNG - it happens at the start - but I don't think they do. A general recognition of an AGIF requires looking for frame delays, and that can be quite tricky. Also what is animated in one GIF implementation isn't necessarily animated in another - a frame delay of 0 is interpreted as about 10 (IRC) by browsers, but other programs interpret it as 0 (following the GIF89a spec, not the unpublished Netscape one.) John Bowler <jb...@ac...> |