How do I change the selection border in Photoshop?

To create a selection border in Photoshop from an existing selection, follow these steps:

Steps to Create a Selection Border

Photoshop allows you to easily convert a solid selection area into a selection that outlines the original area with a specified thickness. This is often used to create outlines or frames from existing selections.

Here's the process based on the provided information:

1. Make an Initial Selection: Begin by using any of Photoshop's selection tools (like the Marquee, Lasso, Magic Wand, or Quick Selection tool) to select the area you want to border.
2. Access the Modify Menu: With your selection active, go to the menu bar at the top of the screen and choose Select > Modify > Border.
3. Define Border Width: A dialog box will appear asking for the Width of the border selection. Enter a pixel value between 1 and 200 into the text box. This value determines the thickness of the selection outline you are creating.
4. Confirm: Click OK.

Once you click OK, your original selection will be replaced by a new selection that consists only of the border around the area you initially selected, with the width you specified. This new selection can then be filled, stroked, deleted, or used for other operations.

Note: This method creates a new selection of a border around an existing area. It does not change the appearance (like color or thickness) of the "marching ants" animation that visually indicates the boundary of any selection.

Summary of the Process

Here's a quick reference:

Step	Action	Menu Command	Input	Result
1	Create an initial selection	N/A	Use selection tool	Active selection
2	Access Border command	Select > Modify > Border	N/A	Border Selection dialog opens
3	Set Border Width	N/A	Enter 1-200 pixels	Value is applied
4	Apply Changes	N/A	Click OK	New selection is a border

Following these steps will effectively change your selection from a solid area into a selection outlining that area as a border.