I often get client briefs asking for “300 dpi” on vector custom illustrations. Trivia: that 300 number comes from doubling a 150 lpi halftone screen for 90s offset printing; for line art you want 1200 dpi or, better, clean vectors. Anyone else still explaining this during project kickoffs?
I keep a one-liner in briefs — “vectors are resolution‑independent; only placed rasters need about 300 ppi at final size” — and include a quick proof PDF showing 150 lpi vs 200 lpi so it clicks. Caveat: with FM/stochastic screens and many digital presses, the 300 rule is fuzzy, so I target 1.5–2× the press’s stated lpi or just point them to https://www.prepressure.com/printing/technology/dpi-ppi-lpi.