My previous message to this list was rejected, so I will try again :)
I went with David's suggestion, with a couple of minor modifications for
command-line syntax on Windows:
convert nz_day.jpg nz_clouds.jpg ( +clone -channel a -fx
"(r+g+b)^2.0/(3^2.0)" ) \
-delete 1 -composite nz_composite.jpg
This worked perfectly!
Regards,
Ashton
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