Thanks for the advice, I will use PNG (it's for HF manipulation)!

Philippe


>Careful with writing GIF files!
>
>GIF is *not* patentfree. For any application that can write files in the
GIF
>format you have to pay license-fees to the patent owner Unisys. And they
are
>*very* strict about that! Better not get caught writing GIFs without a
>license...
>

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