I want to be able to create this clean bevelled edge on the border of a picture in GIMP, Photoshop or Inkscape. This is an example of what I want to recreate:
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This is a very basic layer effect in Photoshop, please take a look around the internet before asking such basic questions here. – Luciano Sep 19 '16 at 14:48
In Photoshop, edit the Layer Style and use Bevel & Emboss:
- Style: Inner Bevel
- Technique: Chisel Hard