Re: APNG MIME type and extension

> From: Vladimir Vukicevic
>>APNG is a backwards-compatible extension to PNG, as was said
>
> It is not.

{.....}  See previous message for all article.

> It is worse than incompatible.
>
> John Bowler

I completely agree with John Bowler.  Up to now I was following quietly the
discussion about APNG and I really don't like what I am reading.

This proposal is turning a very well done file format into a Babel tower.

The only way to "better" respect the PNG specs is to have only 1 big image
composed of many subimages.  The aCTL chunk indicates the real size of the
animation target rectangle and the loop count.  Each followed fCTL chunk
contains the usual stuff, a frame number and indicates the subrectangle
containing the frame image from the big image.  The fCTL chunks do not need
to be in order.  Subrectangles can have different sizes and overlap (if two
frames are identical then they can share the same subrectangle), opening the
possibility to create great animation effects with ridiculous small file
size.  Since all the fCTL chunks come before the IDAT, an infinite loop
animation may begin immediately when first IDAT chunk is read so interlacing
animation is also supported (animation detail quality increases over time).

Unfortunately, I already proposed something like that few months ago and it
was rejected even for discussion because the big image is not 1 image but
many images and applications not supporting the aCTL and fCTL chunk will
display a huge image looking like garbage.  At least an application not
supporting the aCTL and fCTL chunk can edit all the frames in this format.

I will vote against a Babel tower for sure.
I will NOT necessary vote for my own modifications proposal as well because
I feel unconfortable with the idea of a huge garbage image displayed by old
browsers.

Why did you not simply create a new extension .pna?  That will solve all the
problems.

 _________
/   Adeluc   /
¯¯¯¯¯¯¯¯¯
Keep it simple and stupid!






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