Selections and Gaussian blur

Started Aug 27, 2018 | Discussions thread
richardplondon
richardplondon Forum Pro • Posts: 10,894
Re: Selections and Gaussian blur

JulesJ wrote:

Simple. Set feather to 0 before making selection.

That's no good though - blur will still contaminate the contents inside the selection boundary, with pixel content coming from outside the selection boundary, even  if that boundary is itself a sharp line.

The only two ways suggested to circumvent this behaviour, as explained and illustrated already, are either:

  • to use a Lens Blur instead, this requiring a masked depth map
  • to copy just the selection onto a separate layer (denying it any surrounding pixel content that it could mix in); lock transparency of this separate layer (so as to avoid contaminating the transparency channel of this separate layer, around the edges of its own pixel content); then blur that layer only - and then, optionally merge it down to the starting layer.
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