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I'm using Starrylandscape stacker to create some Astrophoto shots.

One of it's functions is to separate  background from the sky/stars.  

It will output two files ...  one TIFF of the final result and another TIFF of the mask it uses.      The intent is to load both into a program like Affinity and re-use  the mask. 

How would I load that mask file in AP?   

I have attached an example. (horrible shots, but it gets the concept across) 

Thanks in advance 



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Look at this post to see how to get the mask as a selection:

Once you have the selection you can save the selection out to a file. Top menu bar: Select-> Save Selection -> To File....

You can use that saved selection file to load into the other tiff. Top menu bar: Select -> Load Selection From File....



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