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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 

P5170008-Min-mask.tif

P5170008-Min.tif

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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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6 hours ago, FarFromSane said:

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?   

You only need the "P5170008-Min-mask.tif" file because it contains the complete image but with some pixels being transparent.

To convert it to a fully opaque pixel layer plus a separate pixel mask:

  1. Open "P5170008-Min-mask.tif" in AP so you have a new document with a partially opaque pixel layer named "Background".
  2. In Channels panel, right-click "Background Alpha" thumbnail and pick Create Mask Layer.
  3. Again right-click "Background Alpha" thumbnail, but pick Fill this time.

 

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