halftone

US /ˈhæf.toʊn/
UK /ˈhæf.toʊn/
"halftone" picture
1.

the reproduction of an image in which the various tones of gray or color are produced by dots of various sizes, which are usually arranged in a grid pattern.

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The newspaper used a halftone process to print the photograph.
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Early comic books often featured crude halftone patterns.
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screendot patterndither
1.

to convert an image into a halftone.

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The graphic designer decided to halftone the image for a vintage look.
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You can use this software to halftone your photos for screen printing.
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screendotdither