> i have a grayscale image (layer). now i want to add transpary 
> to layer (the 
> black parts are not the be transparent, the white parts are to be 
> transparent, the gray parts are to be 50% transparent. so how 
> can i transform (or add) a black and white image to a kind of 
> transparency mask ??

You can do this by masking (with a layer mask) the image with the inverse of
itself.  In other words make sure that the background has an alpha channel,
copy the image, add a layer mask and paste the copied image into it.
Finally invert the colours of the layer mask.

Steve Crane
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