Michael J. Hammel wrote:

> Open RGB image. 
> Add an alpha channel (Layers->Transparency->Add Alpha Channel) 
> Add a layer mask (Layers->Mask->Add Layer Mask) 
> Open grayscale image - copy into layer mask you just created (Edit->Copy 
> in grayscale image, Edit Paste with Layer Mask active in the RGB image) 
> Optionally, apply the layer mask (Layer->Mask->Apply Layer Mask). 

Thanks Michael, worked like a charm.

- Ernie                                  http://home.comcast.net/~erniew
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