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Imaginary

[AP] Refine selection preview issue

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Inside the "Refine selection" dialog when I select "Transparent" I get a preview that is slightly different from the result after applying the mask.

I made some screenshots to demonstrate this behaviour:

1. Make a selection, then choose "Refine Selection":

5a2bce5578e31_2017-12-0909_27_09-RefineSelection.png.793dcd9fc6ab8bcf7897f7193a67f789.png

2. Choose "Transparent" from "Preview", the legs of the subject show only a very small halo:

5a2bce5751336_2017-12-0909_27_24-RefineSelection.png.bdc8f40eccdd39f83dbdcc5dd5084bce.png

3. Choose output as mask and apply, now the halo has become much more visible, which is quite different from the preview:

5a2bce598b6e7_2017-12-0909_27_37-AffinityPhoto.png.f63d2da80301f776ed8dc93a801fff03.png

 

Why is there a difference between the preview and the final result?

 

(The images were taken from "Compositing in Photoshop From Start to Finish" with Bret Malley on http://craftsy.com )

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@Imaginary:

Do not use "Selection" or "Mask" for output, but "New Layer" or "New Layer with Mask".
Maybe one of the moderators can explain why it does not work with "selection" or "mask". Does that have a deeper meaning?

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