What exactly does "border buffer" mean?

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#1

Hi ,
What exactly does “border buffer” mean?
or what’s the exact mathematical definition of “5% border buffer”?

For example, a 1000 * 1000 px crop with 5% border buffer. what’s the exact outcome?

  1. 950 * 950 px (5% of the width and height in total length)
  2. 974.7 * 974.7 px (5% of the crop area)
    or otherwise?
#2

It disregards the outer 5% of the image on all sides, so in this example, it disregards 50 pixels on each side. So the final, considered dimensions would be the center 900x900px, with 50px on each side disregarded.

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#3

thanks, it helps a lot!