Glossary search results: 7 Halftoneconverting a continuous tone to dots for printingHead-to-headright reading sheets with head on top, that, when duplexed, heads run together on front and back of sheet. The back sheet is right-side upHead-to-toeright reading sheets with head on top, that, when duplexed, heads run opposite on front and back of sheet. The back sheet is upside downHHhead-to-head (see head-to-head definition)Hickeyreoccurring unplanned spots that appear in the printed image from dust, lint, dried inkHighlightthe lightest areas in a picture or halftoneHThead-to-toe (see head-to-toe definition)