How to Proof Halftone Patterns
It is important to choose the right type of proof when reviewing halftone patterns. Ink-Jet proofs, which have become much more common, do not display halftone patterns. The dots that you will see on these proofs are caused by the ‘dithering’ process and are not based on the grid and size variations that create a halftone pattern. As a result, an image might look ok on the Ink-Jet proof, but flawed and unacceptable on the final product. Obviously, the whole point of the proofing process is to catch any errors or flaws before printing thousands of copies of the document. So, in order to properly review halftone patterns, you should ask your printer for both an Ink-Jet proof and a blueline proof.
It is important to remember that while the cost of producing these two proofs is pretty much the same, the cost of making changes to the final product are much different. Making changes to an Ink-Jet proof are inexpensive as no film has been created. However, with a blueline proof, because a film was used to create the proof, a new film will have to be created in order to incorporate the changes. It is up to you and your printer to decide which changes are absolutely necessary and which imperfections you can live with.
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