White spots on plate I — development within a stamp field PROTOTYP / PROTOTYPE

A white spot is locally weakened or missing print — a damaged or clogged place on the plate that develops during printing. The collection currently records 92 plate-I copies with a white spot across 27 stamp fields (most: field 9 — 16 copies, field 65 — 9, field 27 — 7). This page shows the proposed presentation using field 9 as the example.

Field 9/I — where the spot sits

The location was found automatically: each copy is compared with the median design of the field built from healthy copies; the “missing ink” is accumulated over all 16 copies. The focus falls on the right border column at the end of SLOVENSKÁ.

Development series — 16 copies ordered by spot strength

Ordering is currently by measured spot strength (index = mean missing ink at the focus); copies with legible cancel dates can be ordered chronologically to follow the true development in time. The crops are registered — the spot sits in the same place on every copy.

What the full version would look like

The same template for all 27 fields: field selection as in the comparator (←/→ arrows), heatmap + development series + full stamps, and a “white spot” badge in the plate-I gallery linking here. The counterpart — smears (excess ink) — can be added by the same method with the opposite sign.