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Thanks guys....
It appears the basic problem is that the required action is not supported in CS3 - bumma!
Joe,
Interesting... I'll have a good look and see if it can be used.
The task is to make an artificial solar flat (when using a spectroheliograph) then divide the light image by this flat. Easier to do within the one program (PS) than by exporting to other imaging programs....
(The reference doc is 1.3Mb PDF but if anyone is interested I can forward a copy)
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