The halftone conversion that we will do in this tutorial will produce a halftone image of approximately 35 lines per inch. 35 l.p.i. dots are fairly large. However, these “big dots” produce an image that is an easy to print film positive and an easy to expose screen. You could use a screen as coarse as 155 mesh to print a 35 lpi halftone dot. However, a 180 to 205 mesh count screen coated with one light coat per side of photopolymer emulsion would be ideal. If you need a finer halftone image (45 to 65 l.p.i), you will need to use Adobe Photoshop and and an application like Wilflex EasyArt Print Halftone (Automated Photoshop Actions).