[magick-users] Animated PNGs

[Glenn Randers-Pehrson]

At 04:51 PM 1/2/70 +1000, Daniel Freeman wrote:
>I expect that the PNG format can support animation?

Yes.  The file extension is .mng instead of .png and the
signature bytes are different.


>(frame by frame - 
>although I notice that Fireworks can't export such a file)
>Does a typical web browser enable you to display an animated PNG?

No.  Mozilla did up until June of this year but then they removed
MNG support.

>If so, how do I create an animated PNG using PerlMagick?

ImageMagick supports MNG:

Using the commandline interface, it's

convert *.png output.mng

or

convert animation.gif animation.mng

You can figure out how to map that over to PerlMagick.

>I'm trying to get around the LZW patent by using something else (yes, I 
>know I could compile ImageMagick/PerlMagick with LZW enabled - but I 
>doubt whether I could convince my web host to do this)
>
>When does that damned patent run out (in the rest of the world) anyway?

The last one expires July 7 2004 (Canada) although it is probably not
enforceable there after June 20 2004 (one year after the US patent expires).
I am not a patent lawyer...

Glenn