While I normally use Photoshop to crop and edit my drawings, this time I used the free Gimp 2.8 software to see if I could get similar results.
I had been looking for an easy way to apply a halftone effect to my drawings and Gimp has a filter called ‘newsprint’ that can do this. It’s hidden in the distorts menu ( Filters -> Distorts -> Newsprint).
After some trial and error, I ended up with the settings below.
Cell size is the most important parameter here. The line option in the spot function menu gave also interesting results.
The halftone effect was a little strong, so I duplicated the original layer and applied the plugin to this layer. Then I changed the layer mode to multiply and adjusted the opacity down to 55%.