Halftone is a type of shading used to add detail or depth to a
drawing.
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A duotone is a halftone reproduction of an image used in
contrast with another halftone. This concept brings out the middle
tones of an image.
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The Halftone app is an iPhone, iPod and iPad application that
turns photos taken into vintage comics that can be shared with
family and friends through social media.
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Halftone is a graphic "optical illusion" that uses dots of the
same color, but varying sizes, shapes, and spacing to recreate a
gradient like effect. The eye blends the dots into a seamless
tone.