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Take one picture, copy and paste as new layer (Ctrl-C, Ctrl-L)
Select the top frame
Select Colours, Adjust, Hue/Saturation/Lightness (Shift-H)
Set Hue and Lightness to zero, but drop the Saturation down to -100
to give you a completely grey image
With the select tool, draw an ellipse justlarge enough to
focus on the coloured area.
Then feather the selection (Ctrl-H). You will need a lot of feather,
larger images will need more feathering. This sample feathered to 40 pixels.
Delete the selected area (Ctrl-X)
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