When you’re ready to print your image, use the following guidelines for best results:
Set the parameters for the halftone screen.
Print a color composite, often called a color comp. A color composite is a single print that combines the red, green, and blue channels of an RGB image (or the cyan, magenta, yellow, and black channels of a CMYK image). This indicates what the final printed image will look like.
Print separations to make sure the image separates correctly.
Print to film.
To specify the halftone screen when you print an image, you use the Screen option in the Print With Preview dialog box. The results of using a halftone screen appear only in the printed copy; you cannot see the halftone screen on-screen. ...