You need to use a transparent bitmap image as the mask (i.e. a 
transparent shape inside a SWF), both masker/maskee must be 'cached as 
bitmap'.

George

Michael Wagner wrote:
>
> Hi:
>
> I would like to make a mask / effect  in Flex
> to get from a.bmp using b.bmp as a mask to get c.bmp
> using bitmap operations probably.
>  
> Do you know how it can be done?
>
> Thanks,
> Michael.
>
>  

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