Expand or contract a selection by a specific number of pixels

Use a selection tool to make a selection.

Choose Select > Modify > Expand or Contract.

For Expand By or Contract By, enter a pixel value between 1 and 100, and click OK.

The border is increased or decreased by the specified number of pixels. Any portion of the selection border running along the canvas’s edge is unaffected.

Photoshop

Expand or contract a selection by a specific number of pixels

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