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HAIRLINE REGISTER - Register within +/- row of dots.
HALFTONE - The reproduction of continuous-tone images, through a screening process.
HICKEYS - Spots or imperfections in the printing due to dirt on the press, dried ink skin, paper particles, etc.
HIGHLIGHTS - The lightest or whitest parts in a photograph represented in a halftone reproduction by the smallest dots or the absence of dots.
HOLDOUT - A property of coated paper with low ink absorption which allows ink to set in the surface with high gloss. Papers with too much holdout cause problems with set-off.