Open the Layers dialog ("Windows/Dockable Dialogs/Layers"), left-click on the
relevant layer in the Layers dialog to make it active then set the "Opacity"
field near the top of the layers dialog.

>I'm an ex Photoshop user who does astrophotography (AP).  In AP we
>frequently shoot a number of photos that we then stack in layers to
>reduce noise or create color channels.  One problem with stacking is
>that the sky may move between photos. (It's called field rotation.) 
>This can be corrected if the stack is aligned properly.  While
>Photoshop has a number of automated stitching techniques available, I
>can't find any of these in GIMP.
>
>I could manually align layers in stacks if I could reduce the
>transparency of one layer relative to the layer below it.  Is this
>possible?

-- 
programmer_ceds (via www.gimpusers.com/forums)
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