Add Pizzazz to Your Portraits using Halftones

Radius
The Radius setting affects the size of the halftone dots and the spacing in between. Adjust the size of the dots to change the gradient and blur of the color and image. Smaller dots will look smoother and subtler, while larger dot sizes will evoke lower-grade print material like vintage comics, old advertisements, or DIY grunge ‘zines.
Channel
The Channel setting adjusts the way the dots are placed and how they overlap. Each Channel is controlled by a Screen Angle setting. The value is listed in degrees. Adjusting the value changes the angle at which the Cyan, Magenta, Yellow, and Black dots are added to the pattern. Where the dots overlap, they can form new colors, depending on how they combine.