Race photographs when bib numbers are hidden or missing

Every race has runners whose bibs do not show. A jacket covers the number, a hydration vest sits across it, or the bib stays in a bag. The photographs may be good, and the runner may still be impossible to identify from the number alone.

This page belongs to our guide to running, cycling and endurance-event photography.

Why does a missing number matter?

A bib is the simplest link between a photograph and a name. When it is visible, a person or a system can read it and file the image. When it is hidden, the link is gone, and the work shifts to other clues.

For the runner, the result is a gallery with no obvious picture of themselves. For the organiser, it is a stream of questions after the event. Preparing for this beforehand is kinder and cheaper than answering each one later.

What else can identify a runner?

No single clue is enough, but several together can help.

• Finish time. It narrows the images to a short window.
• Category or wave. It narrows them further.
• Kit. A distinctive colour or logo helps a human reviewer.
• Position. A known place on the course ties an image to a time.
• The runner's help. A description, an approximate time or a sample image can resolve many cases.

Each clue is imperfect. A person comparing them can often find a match, but cannot be sure of success.

What can we honestly promise?

We can promise to look reasonably and to say honestly if nothing is found. We cannot promise that every runner's photographs will be recovered, that every image has been matched, or that an automated tool will succeed.

Facial matching is sometimes suggested as a solution. Its reliability, its data needs and its privacy implications vary, and we do not assume it is suitable. See facial recognition and automated guest-photo search for the questions to ask. If a tool is proposed, we check its own technical documentation before saying what it can do.

What are the privacy points?

Asking runners for a description or a time is a small collection of personal information. Keep it to what is needed, say why you want it and delete it when it is no longer required.

The Personal Data Protection Commissioner's page states that the 2010 Act governs personal data in commercial transactions. How it applies to your event is a legal question for a qualified adviser, and contracts and venue rules may add requirements. Our guide to removal, withdrawal and deletion requests covers the related request that a runner might make.

A short example

For example, imagine a runner who wore a rain jacket over the bib and cannot find any photograph. The organiser offers a short form asking for the approximate finish time, the category and a description of the jacket.

A reviewer searches the finish-window images for that category and jacket, and sends a small set to the runner to confirm. Some cases succeed and some do not. This is a hypothetical process, not a past job.

How do we prepare runners in advance?

Tell runners before the race to wear the bib on the front, unfolded and uncovered. Remind them at the start. This one message prevents most of the problem.

Also say what happens if their number is hidden. A short note in the race pack avoids disappointment. For how runners usually find their images, see participant identification in endurance-event galleries, and for races with paused or restarted sections, read paused or restarted races in the delivered photo record.

What we confirm in writing

Your quotation states the sorting method, the process for missing images and who handles requests. Delivery arrangements are checked against the photo delivery acceptance checklist, and the photo sharing and privacy plan records what personal details are collected. Rates and timing appear in the written quotation.