While it might sound complex, creating a rounded border with a customized radius on each corner is straightforward in Adobe Photoshop CC 2014. To begin, create a border with rounded corners using the Rounded Rectangle Tool. After it's set up, you can specify the radius for the corners and even apply a different radius for each corner.
Launch Photoshop CC and create a new document. Select the "Rounded Rectangle Tool" from the Toolbox. If the Rounded Rectangle Tool isn't visible, click the tool displayed on its group to reveal it.
Drag the cursor across the canvas to draw a rounded rectangle. Note that the same settings in the Options bar are also in the Properties panel. Click the "Fill" button and select "No Color" so the rectangle becomes a border.
Specify the stroke color and choose the desired weight by dragging the "Stroke" slider.
Click a "Radius" text field in the Properties panel to change the radius. Note that there are four Radius controls, each corresponding to the corners of the rounded rectangle. When the "Lock" icon is highlighted, the same radius is used in every corner.
Click the "Lock" icon to deselect it. You can now specify a different radius for each corner by typing a value in each Radius text field. Adjust the border's size as needed and place it in front of a photo, text box or other object in your Photoshop project.