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star masks

Community Beginner ,
Nov 28, 2022 Nov 28, 2022

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I created a star mask in Deep Sky Stacker and am trying to apply that mask (mask is a tiff file).  I open both the mask and the main deep sky image in photoshop (Mac), select the image and in its layer panel and "add mask".  Then view the mask ("option click") and paste the inverted mask file into the mask.  This does not mask out the stars in the mask.  Is there a better (or more correct) way to apply this external mask file in photoshop?

 

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Cross-app workflows

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Community Expert ,
Nov 28, 2022 Nov 28, 2022

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Could you please post screenshots with the pertinent Panels (Toolbar, Layers, Options Bar, …) visible? 

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Community Beginner ,
Nov 28, 2022 Nov 28, 2022

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Here is a screen shot after creating (pasting) the star mask.  The "pixelated" looking "stars" are in the position of the stars in the mask.  

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Community Expert ,
Nov 28, 2022 Nov 28, 2022

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That result seems as expected – the transparency grid being visible where the Layer Mask is black (and therefore hides the Layer’s content). 

What do you want to achieve? 

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Community Beginner ,
Nov 28, 2022 Nov 28, 2022

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Thanks for the explanation.  The "density" was set to 100%, which as I understand is part of the effect the mask has, but I went to "preferences/transparency" and set the grid size to small and the color to dark or medium, and the mask was more effective.  It also made clear to me the difficulty in matching the black in the mask to the background dark sky. Thanks for your help!

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Community Expert ,
Nov 28, 2022 Nov 28, 2022

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Maybe you should insert a Solid Color Layer behind the masked Layer. 

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