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Where
you are: What
Are Printing Halftones and Linescreens? A printing press is able to produce only clear, defined images in the color of the ink on the press. To reproduce a wide range of continuous and intermediate tones of gray in a black and white photograph, the photograph must first be converted to an image that conforms to this limitation. This conversion is done by the use of halftone screens. By shooting a photograph through a screen of dots with a stat camera, the image is converted to rows of tiny black dots. The size and intensity of these dots is relevant to the darkness of the gray areas. These days, photographs are usually scanned into a computer system and output with the halftone screens. The photo can be printed at whatever screen frequency you desire. The resulting dots create an optical illusion. Because the dots are so small and are of varying proximity to each other, our eyes are fooled into seeing shades of gray when there's only black dots. Halftone screens are measured by the number of lines of dots in an inch of the screen. The halftone screen frequency, or linescreen, that one uses is dependent on the capabilities of the press and the paper that will be used to print a project. Presses that print newspapers are only capable of handling a low linescreen like 85 lines per inch (lpi). Quality magazines use linescreens of 150lpi and up. The finer the linescreen (the more dots per inch), the better the reproduction quality and detail you'll see in the image. However, a word of caution: a linescreen that is too high
for a paper or press' capabilities, will not look very good at all. The
dot pattern will start to fill in and the images will look blotchy and
muddy. Ask your printer what linescreen they prefer. You or your designer
will need to know this before printing film can be ordered. Your designer
will also need to know this before images can be scanned so he/she knows
what resolution is required. Tip: There are Graphic Design classes in your area. Sign up for FREE information from top design schools.  Some
Links You May Find Useful
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ow
can a printer print a grayscale photograph with black ink? A
mystery of the universe? No, but I do think whoever came up with this
one should've gotten a big bonus in their paychecks. Think how different
our world would be if we couldn't print photographs in our books and magazines!
Okay, on to the explanation...
