> That is indeed a clever construct. I was just pottering around with the
> 'max' function when Mike posted the answer. This all seems to open up a
> world of image post-processing potential, though I can't immediately think
> of any particular real-world applications :-)
>
> Regards,
> Chris B.

I'm actually trying to emulate the layer blending modes as found in Photoshop.
Most of them are straight forward as long as you know the algorithms. It was
just 'overlay' that had me stumped.
'Select' works brilliantly. Problem solved!

Caz

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