Trapping
A hairline overlap between printed colors that hides white gaps when the plates land a fraction out of alignment.
See it
What it is
Trapping is a deliberate hairline overlap between neighboring ink areas. If the paper or plates shift slightly on press, that overlap keeps the paper from flashing through as a white gap. A spread grows one color outward; a choke pulls the neighboring boundary inward.
Use it where adjacent inks meet and a small registration error would be visible. Modern RIPs often calculate traps automatically, while small 100% K text is commonly set to overprint instead of being trapped like two process colors.
Gotcha: more overlap is not safer. An oversized trap makes a dark halo, and trapping tiny knockout details can close them up. Trapping and overprint are related controls, not synonyms, so inspect both in Adobe Acrobat Pro's Output Preview before plates are made.
Ask AI for it
Trap this offset-print artwork by spreading the lighter ink 0.1mm into the darker neighboring ink, keep white and other knockout details knocked out, and set small 100% K text to overprint. Do not trap photographic edges. Verify every result in Adobe Acrobat Pro Output Preview with Simulate Overprinting enabled, then list any edge where a 0.1mm trap creates a visible halo.