> >By merely placing two images side-by-side the colour changed!
> >
> >How come?

> 
> Because each gif can have a different set of 256 colors. When you 
> abut them and make a new image, IM must select one composite set of 
> 256 colors. Thus some colors will be lost.
> 

Good thinking FW! But in the cases I am concered about, all images
employ the same colour palette.

> P.S.

> Use PNG instead of GIF

Can't, the present depends on a large historical backlog
of gifs (and IM commands).

Regards

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