For giving your software a known reference: a chart of printed patches whose values are documented, photographed in the same light as the subject. It corrects colour after the fact rather than changing the light.
A colour checker is a set of patches with documented values. Photographing it under the light of the scene gives software something known to work back from.
What it fixes
Not the light, and this is the distinction that matters. A lamp emitting unevenly still emits unevenly; the chart lets a profile compensate for how those uneven emissions were recorded. Where the lamp emitted nothing at all in part of the spectrum, no chart recovers it.
Where it belongs in the order
After the light and before the screen. Add or match sources first — eight titles in this catalogue publish a colour temperature and four a rendering index — then photograph the chart in the first frame of each setup, then profile.
What the catalogue holds
Grey cards are a family here, and the same shelf carries charts with multiple patches. The published figure in both cases is the size; neutrality and patch accuracy are the product and are rarely quantified on a listing, which is why this site reports what each states rather than ranking them.
The habit that makes it work
One reference frame per lighting setup, not one per session. The moment the light changes, the earlier reference describes a light that is no longer there.
What people ask before they commit
How is it different from a grey card?
A grey card gives one neutral reference, which sets white balance. A colour checker gives many patches across the spectrum, which lets software build a profile — useful when the light renders some colours badly rather than merely casting the whole frame. The card answers a cast; the chart answers fidelity.
Do I need one for ordinary photographs?
No. It earns its place when colour has to match across a set, across two cameras, or against a physical object — product work, reproduction, anything a client will compare side by side. For a single picture judged by eye, a neutral reference is enough.
Last reviewed 12 September 2026