Q. cut selection, paste to a new layer creates hairline

[ampolsky]

If I have a large file cut a selection and paste to a new layer, I end up getting a hairline - I usually fix it manually by scaling the pasted item slightly, but that's a pain.

Is there are way to do this without creating this artifact?

[Trevor.Dennis]

Can you describe your exact workflow?

A full res screen shot is going to be useful here.  Make it of your entire workspace showing document window and layers panel.

[ampolsky]

Sure -- I apologize for not having posted workflow before !

Details -- system -- Mac M1 Powerbooks, Sonoma OSX

1. load an image file -- in this case I'm using a photo shot with my Olympus
2. make a selection and cut (not copy) it
3. Paste it into a new layer, in the same place ( shift -command - V)
4. Hairline is very noticeable 

5. Flatten image -- hairline is slightly less noticeable than when in layers, but its still there, and is present in files exported.

[Semaphoric · Accepted solution]

When making your selection, be sure the Anti-alias box in the Option bar is unchecked.

[ampolsky]

Thank you -- that helped enormously. The other thing that helped -- I mention this in case anyone else has this problem -- the way that I was cutting the selection from the Background layer, was particularly troublesome. The BG layer doesn't have transparency, so when you do a cut, you get an automatic fill, and in this case it was with white, which calls out the problem. Doing a cut from a layer that it is not BG, creates transparency, a hole, rather than a white fill . . . so you can actually do the cut antialiased, and without that white fill to come through, it wouldn't create this artifact.
I suspect that a selection using a the Pen tool might also work with this, but I haven't yet experimented enough