[RickS (Rick)]

Originally Posted by philiphart

http://pixinsight.com/forum/index.ph...;topicseen#new

Juan has replied with exactly the kind of info I was hoping for. Now I just have to learn how to use scripting in PI.

No scripting needed, Phil. That's just a PixelMath expression, albeit a slightly complicated one. If you have any trouble getting it to work I can build you a process icon that you can just load into PI.

Cheers,
Rick.