Re: [ProgSoc] Question for graphics people -- building animated PNG pictures

[vik <vik4@nospam.mindless.com>]

A java applet to animate it may be worth looking at. Don't know of any
pre-built ones around, but then I haven't really been looking. Some
ideas and code on writing one is at:

http://home.kabelfoon.nl/~jbokma/java/Animation.html

Telford Tendys wrote:
> 
> I have a bunch of pictures in Ghostscript format which include colour and
> have a correct bounding box, etc...
> 
> I want to convert them into PNG files so looking at the ``gs --help'' output
> I have the devices available that might relate to PNG:
> 
>         pngmono pnggray png16 png256 png16m
> 
> There are also have a few JPEG devices but these pictures are plots with sharp edges
> and flat blocks of colour so JPEG would probably blur it beyond recognition so forget
> about JPEG for the time being.
> 
> Now I don't have much problem with the concept of taking a single ghostscript
> picture and converting it over to png256 but what I really want to do is a bit
> more than that -- each of these files is a frame in an animation sequence so I
> need a method of building an animated system of frames in a PNG format.
> Frankly I don't care what web browsers can view it -- so long as SOMETHING can
> view it for me to look at -- because I sure as anything won't be putting any GIF
> files up on my web page.
> 
> One further question, I want the sequence to run forward through all the frames,
> then stop and pause a bit, then run backward through all the frames. It seems a waste
> to include the same frame twice so can I tell the animation sequence that I
> want to reuse some of the frames in a different order? Does the PNG standard
> support a Markov chain to step between frames (not that I need that but it could
> be useful for other cases).
> 
>         - Tel
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-- 
vik

vik4@nospam.mindless.com
http://www.progsoc.uts.edu.au/~vik
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