4 Complete your border effect

With your border layer active, set the Blending Mode to Screen, then press Ctrl/Cmd+T. Hold Shift and pull out the corner handles so the border covers the entire image right up to the edge. When you’re happy with its position, press Return to set down the changes. This will round off your arty image with a white brushed border that’s ideal for printing – but if you prefer a black border (perhaps for use online), it’s quick and easy to do.

With the border layer active, press Ctrl/Cmd+I to invert the border’s colours (making the white areas black and vice versa). Now click where it says Screen and change the Blending Mode to Multiply.