Concept:
This command increases or decreases the border area by the specific
pixels mentioned.
1. Open Photoshop. Open Image to apply Expand &
Contract commands.

2. Select the Magic Wand Tool and click on the white
background area around the picture.

3. Select > Inverse
You will get following selection. Now let us apply
Contract Command.

4. Select > Modify >
Contract (Contract by 20 pixels)

5. Go back to the original selection and apply Expand
Command.

6. Select > Modify >
Expand (Expand by 7 pixels)

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