Concept: This will create a new border to the existing selection. The effect
will be smooth. If you want hard edged fill, you need to use stroke
command.
1. Open Photoshop. Open Image to apply modify border
command.

2. Select Rectangular Marquee Tool and draw rectangular
selection around the picture.

3. Select > Modify >
Border (add 4 pixels width for border)

4. Select any desired color for foreground and fill
the color in the selection using ALT + Del key. Press CTRL + D to
deselect.

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