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| Halftone | | | | Photographic images formed by a pattern of discrete dot sizes. Dots vary in area and shape but have uniform density. Creates the illusion of continuous tone when seen at a distance. | | |
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| | Halo | | | | An undesirable peripheral outline of the printed image | | |
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| | Heat Seal | | | | A method of uniting two or more surfaces by fusion, either of the coatings or of the base materials, under controlled conditions of temperature, pressure and time. | | |
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| | Hickey | | | | A common printing defect, visible as a spot surrounded by a blank halo, caused by a speck of dirt pushing the paper away from the printing plate. | | |
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| | Hue | | | | The characteristics by which one colour is distinguished from another. | | |
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