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Hi Marc and Allan,
Thanks for the comments.
They are all the same shot. The "Ha" looking one I produced by experimenting with the High Pass Filter and Selective Colour in Photoshop. I was surprised at the amount of gas detail it brings out. Unfortunately, I have not yet learned enough about Photoshop to take it any further.
Marc, I just got back from Wiruna and it was a perfect night. Hopefully the photos will be ok.
Thanks.
Ross.
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