Step:1 Open your image put a selection around the part of the image that you would like to put the pop dots effect behind.
Step:2 Press Apple+J twice. Put a selection around layer 2
Step:3 Go under the Select menu, under modify and choose Expand. Enter 10 pixels and click okay.
Step:4 Press "d" to switch your swatches to the default colors. Option+ Delete
Step:5 Press the letter "Q" to enter quick Mask mode. Go under the filter menu, under Pixelate, and choose Color Halftone. Click okay.
Step:6 Keep running filter until you are satisfied with the results. Tap the letter "Q" to leave quick Mask mode.
Step:7 Option+Delete. Deselect your image.
