How to delete a selection with straight edges in Photoshop

I have an issue deleting selected area in Photoshop.

I use pen tool -> make a selection -> set 0px feather, +anti-alias ->
And I have a result like below:

enter image description here

Am I missing something to get straight and accurate edges ?
Maybe that’s relative to some sort of pixels snaping?

UPD. Without anti-alias:
enter image description here

Answer

This is called anti-aliasing and yields a better, smoother result when you zoom back out. If you don’t want those half-transparent pixels, you should deactivate the anti-aliasing option when selecting.

Exactly straight edges are only possible in Photoshop when those edges are exactly horizontal or exactly vertical (or maybe if exactly 45°). The nature of a pixel image is a raster of square pixels, so any slope needs to be simulated with anti-aliasing like this.

Attribution
Source : Link , Question Author : Olenia , Answer Author : Vincent

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