(1) Do you have a picture and you want to add a frame ? then
You can use this script to add a frame FU_edges_mats-and-frames-210.scm Get the attached file, unzip and put the file in your Gimp user profile
C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\scripts
That has options for adding both a frame and a shadow: - example https://i.imgur.com/YDFaRo4.jpg experiment with the options.
(2) or the image already has a frame.
One layer, image with frame
Duplicate the layer.
Cut out the picture leaving the frame.
Use Filters -> Light and Shadow -> Drop Shadow on the frame layer: - example https://i.imgur.com/GkWXQei.jpg experiment with the values
You can use this script to add a frame FU_edges_mats-and-frames-210.scm Get the attached file, unzip and put the file in your Gimp user profile
C:\Users\"yourname"\AppData\Roaming\GIMP\2.10\scripts
That has options for adding both a frame and a shadow: - example https://i.imgur.com/YDFaRo4.jpg experiment with the options.
(2) or the image already has a frame.
One layer, image with frame
Duplicate the layer.
Cut out the picture leaving the frame.
Use Filters -> Light and Shadow -> Drop Shadow on the frame layer: - example https://i.imgur.com/GkWXQei.jpg experiment with the values