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Mark,
I used GIMP to stack my images taking only the quarter of Sun that contained Venus but not the sunspots and pasted as new layer. I lined up the two edges of the Sun (from the quarter) with 100% opacity but then used a "Darken Only" mode rather than "Normal". I'm not sure what the equivalent is in PS but it only kept Venus and nothing else from the quarter. If the image was darker than my base image I brightened it slowly until the base image came through.
Does this make sense?
Cheers,
Mario
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