Re: unix and mng composer

Agneta Schick wrote:


> > > I want to make a dot blink so all I want to do is put two pngs ('on'
> > > and 'off') together (one png is a world map of earthquakes - dots-
> > > and the second png is the one earthquake which blinks).  That's all
> > > I want.  So I'm looking for a composer which can be started at the
> > > command line with a time option.

For efficiency you probably want three PNGS

   1. The world earthquake map
   2. The one earthquake "on"
   3. The one earthquake "off"

First display the map, then loop between the (presumably
much smaller PNGs) "on" and "off" images.  The MNG structure would
resemble

    MHDR # tick length defines framing rate (don't need FRAM chunk)
    IHDR ... IEND # full map
    SAVE
    TERM # looping data
    SEEK
    DEFI 0 # location, assume "on" and "off" have same dimensions
    IHDR ... IEND # "on" image
    IHDR ... IEND # "off" image
    MEND

I don't think ImageMagick can manage this complexity though, so you'd
need to try one of the others.

Glenn

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