How to score shooting targets from a photo

Why photograph your cards at all?

Because hand-scoring is tedious enough that almost nobody does it honestly for practice. Shots get eyeballed, borderline calls get rounded up, and half the information on the card — where the group sits, how it drifts through a session — never gets recorded. Scoring from a photo keeps the paper as the source of truth: every hole is measured, and the gauge rule is applied the same way every time.

Taking a photo that scores accurately

Scoring software measures ring geometry from your photo, so the photo quality sets the accuracy ceiling. Four habits make almost every card score cleanly:

1. Lay the card on a contrasting surface. The card's edges must be findable — white paper on a white table is the classic failure.
2. Fill the frame. The more pixels on the card, the more precisely each hole is measured. Get close; don't zoom.
3. Avoid shadows across the rings. Side light from a window beats overhead light that puts your phone's shadow on the card.
4. Hold the phone parallel to the card. Perspective can be corrected, but a square-on photo leaves the least work — and the least error.

Blur and glare are the two spoilers to watch for. Good software flags a doubtful photo instead of quietly scoring it — if a card comes back with a warning, reshoot it.

Scanning a stack at once

After a match day you may have dozens of cards. A phone scanner app (or a flatbed scanner) that outputs a multi-page PDF — one card per page — is the fastest way through the pile: scan the stack in one sitting, import the PDF, and review each card's scores in sequence. Scanners also sidestep lighting problems entirely.

Verify like a jury

No detector is perfect: pellet holes overlap, tear, or hide in the black. Whatever tool you use should show every detected hole and its score drawn over your photo, and let you correct a call — the score should then be recomputed from the corrected position with the gauge rule, never typed in by hand. If you can type a score, the stats stop being trustworthy.

The stats worth tracking

• Series totals — 10-shot blocks are how matches are read; a fading final series is a fitness signal, not a skill one.
• Score distribution — the shape matters more than the average: are you losing points to a wide base of 9s, or to occasional 7s?
• Group size and centre — a tight group off-centre is a sight adjustment; a wide group on-centre is hold and technique.
• An all-shots heatmap — hundreds of shots from weeks of training overlaid on one target reveal your true hold and the direction your points leak.