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How to Achieve a Good Halftone Reproduction
Good quality halftone reproduction in the newspapers requires an 85-line screen for black and white, and for spot color printing. A 85-line screen works best for process color work. Screens should be round dot and conform to standard screen angles. An output of approximately 1000 dots per inch, and not less then 600 dpi, is recommended.

Halftone scans should accommodate a 30 to 35% midtone press gain, allowing for the spread of ink (dots) in the press reproduction process. Unless proper adjustments are made in the prepress stage, images will reproduce darker and flatter than the original.

This can best be accomplished by using the "curves" menu and "unsharp mask" filters in Photoshop, or other image editing software. In the curves menu, a good rule of thumb would be to set the highlight dot at 2 or 3, the shadow dot between 85 and 90, and pull the weight in the midtones from a 50% dot to approximately 35%. This will give the image a "washed out" appearance. It's okay if highlight dots are dropped from non-detail whites.

To sharpen your image in Photoshop using the unsharp mask filter, good results can be achieved by setting the radius for 1.5, the threshold for 7, and sharpening in amounts of 50 (50, 100, 150, etc).


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