GIMP Add border and shadow to a layer
To Add border to layer follow below steps
Select the layer then use menu Layer -> Transparency -> Alpha to Selection. Select -> Border Border Selection window will appear. Enter the size of border you want to show. Layer -> Transparency -> Intersect with selection Edit -> Fill with FG/BG Color You need to select required color from FG/BG color panel. Select -> None With above steps you will be added border to your layer.
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