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8 hours ago, wimvb said:

Yes, but why simplify things? 😋

mean(original, copy) also works. It seems we need more proverbial felines to skin.

Not to flog a dead horse (to continue the unfortunate animal analogies) but in general it is good to know that the coefficients of any number of weighted images don’t have to add up to unity...

a + b/2 + 3*c

Sorry! Didn’t mean to hijack the OP and all the excellent advice here. 😉

Tony

 

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While it is possible to use rescaling, that may also change the blackpoint of the resulting image.

12 hours ago, AKB said:

Sorry! Didn’t mean to hijack the OP and all the excellent advice here. 😉

Imo, any call for help runs the risk of this kind of discussions. That's just the nature of the beast (more animal analogies). 

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