How to Make a Coloring Book

Step 8: Blur the top layer

Select Filter --> Gaussian blur...

A slider called Amount should appear. Try dragging this back and forth to see what happens. The outline of your image should become visible, starting as a thin tracing when Amount is low and turning into softer, thicker strokes as you increase it.

Adjust the slider to a medium point at which you can clearly tell what the image is, but the lines appear neither pencil-thin nor extremely soft and blurry.