How to properly edit a selection before the economy like an alpha channel?

I thought I could just use QuickMask to paint manually with 100% black or white to 100% to set the boundaries of the selection and then save this final selection under my alpha channel.

However, I discovered that when I do that, I end up finding a strange artificat ish (which by the way, I can't understand how to remove it).

I would be grateful if someone could tell me how I should be correctly change the selection before you actually save it.

Thank you!

Capture.JPG

You're not painting with a pure black:

Tags: Photoshop

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