Ah well - I've re-arranged the scene to show lots of detail in the
background, and this seems to have helped - the problem is still there, but
subtler now, and one would have to look pretty closely to notice any
difference.

I'll keep the PNG file format in mind though...thanks again for your help.

Cheers

Tony

Mike Williams wrote in message ...
>Wasn't it Tony who wrote:
>
>>Thanks for the help - will this also solve the transparency problem?
>
>I've never had any problems with transparency using png alpha channels.
>There's always a slight possibility that you're doing something else
>weird in your scene that I've never done that's causing the effect you
>observe.
>
>--
>Mike Williams
>Gentleman of Leisure

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