A term from photography, defined for submissions

Dynamic range is how much brightness a sensor can hold in one exposure, from the darkest shadow that still shows texture to the brightest highlight that has not gone flat white. Push a scene past that limit and the lost detail is not recoverable later. It was never captured.

What "exceeds" looks like

A highlight that exceeds the range clips to pure white - no shading, no gradient, nothing a rating tool's model can read as shape. A shadow that exceeds it the other way clips to solid black, same result. Both are common on a phone sensor, which has a narrower range than the eye looking at the same scene, so a contrast level that looks fine standing there can already have blown a patch of the file before the shutter closes. The gap is old and well documented: Debevec and Malik (1997), in the paper that popularised high dynamic range imaging, wrote that cameras "are not designed to capture even close to" the range between dark and bright present in the real world.

Why it matters for a submission

A rating tool reads texture and shape from the midtones of an image. Blow the highlights on part of the subject and that part is simply missing information, not scored lower on purpose but scored on less to go on - which shows up as extra noise between otherwise identical retakes rather than as an obviously bad photo, and on a tool like Rate Cock that breaks a result into separate axes, a lost highlight tends to show up on one axis rather than dragging the total. What the model is actually reading from a file is a separate question, but it can only read what the exposure kept. The fix has nothing to do with a better sensor: the reference conditions in a standardised submission exist precisely to avoid this failure mode before it happens, and a comparable submission already asks for diffuse, even light for the same reason.

The protocol implication

Avoid contrast extremes: direct overhead sun, direct flash, a bright window directly behind the subject. Diffuse light compresses the scene's own range closer to what the sensor can hold, so nothing needs to be sacrificed to keep the rest. That is a separate recommendation from which direction the light comes from - light direction changes what the tool sees in relief, dynamic range decides whether it sees anything there at all. The same discipline that governs an equipment-side measurement - a tape has its own tolerances worth naming rather than assuming away - applies here: name the condition, keep it constant, and a photography term stops being jargon and starts being one more line in the log. Anyone preparing photos for a person rather than a model benefits from the same avoidance of blown highlights, for the same reason: missing detail is missing regardless of who is looking.