darkening around the edges

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Author: Michael
Date:  
To: PLUG
Subject: darkening around the edges
how does one use a transparent layer? is it only for drawing things on? I
have some old pictures that have darkened around the edges. How I think I
can fix it is to duplicate the layer then lighten the exposure value on
the lower image, then paint black and uncover the lighter image over the
section that has darkened. How do I do this with gradients and Darktable?

--
:-)~MIKE~(-:
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