I don't know a whole lot about image file formats but I've noticed that 
gifs written with GIFReadWriter end up looking worse than when they 
were read.  The (hopefully still) attached image illustrates the 
problem.
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The leftmost image is the original gif.  The rightmost is what the 
imported gif looks like when displayed in a SketchMorph.  They both 
look pretty good.  The middle one is what you get if you write the form 
back out as a gif.  It looks a whole lot worse.

-Todd Blanchard