Shadow Dot

A shadow dot is the last stop before solid ink, generally living between 75% and 90%, and its behavior is pure geometry. A round dot touches its neighbors at 78.5% coverage; past that the open area is four shrinking concave corners, and corners fill far faster than they shrink. Add textile dot gain of 10 to 20 points on heavyweight fleece and an 85% shadow dot on film becomes a 100% flood on the garment. Elliptical dots postpone the collapse by joining along one axis near 40% and the other near 60%, which spreads the damage across two smaller jumps.

The buyer-visible symptom is a photograph whose dark areas turn into one flat silhouette. Tread on a tire, folds in a black jacket, the grille of a car at night, all of it collapses into a single mass of ink, and no amount of squeegee pressure brings it back. On a hoodie job we capped shadow dots at 82% instead of the 90% the art called for, and the customer said the second version looked more detailed. We got there by removing ink.

The method is to cap the shadow on film and let press gain finish the job. Spec 80-85% as the darkest halftone value, run a 5% step wedge on the real garment, and find where your steps stop reading as separate. Higher mesh and lower lpi both widen that gap. The trade-off is depth, which is why many shops carry true black as its own solid spot screen and let shadow dots handle only shape.

The misconception is that 100% in the shadows equals a richer print. On fabric, 100% in the shadows equals no shadow at all. Density comes from ink deposit and mesh choice, not from driving dark pixels to full coverage.