>
> BTW, a question about one of your #while loop lines:
> hfs_pv=hfs_function(0,hfs_V,0).x
>
> Any particular reason why you used .x (i.e., .red) rather than .gray?  Just
> curious.
>
> Ken
>
>

If all 3 colour chanels are the same, it's faster and gives the same result.
Using ".x", you only access one value.
Using ".gray" you need to access all 3 chanels, then you perform a 
ponderated average.


Alain

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