Colour accuracy
Gray Card vs Color Checker: Which One Fixes Your Colour Problem?
If your product shots never quite match the real item, or skin tones shift between locations, the problem is usually colour reference, not your camera. Two inexpensive tools address it: a gray card and a colour checker chart. They overlap, but they solve different problems.
This guide explains what each does, how to use them in a real workflow, and which one is worth buying for the kind of photography you do.
What problem are you solving?
Colour issues usually fall into one of two categories:
- Overall cast: everything is too warm, too cool, too green or too magenta. That's a white balance problem. A neutral reference fixes it.
- Specific colours are off: the white balance looks right, but a red is slightly orange or a blue looks purple. That's a profile problem. A colour checker and profiling software can help.
Most people have the first problem far more often than the second.
Gray card vs colour checker
| Factor | Gray / white-balance card | Colour checker chart |
|---|---|---|
| Main use | Neutral white balance reference | Colour profiling plus white balance |
| Fixes overall cast | Yes | Yes (using its neutral patches) |
| Improves individual colour accuracy | No | Yes, with profiling software |
| Exposure reference | Yes, with an 18% gray card and spot metering | Some charts include a gray patch for this |
| Ease of use | Very easy | Easy to shoot, extra steps in editing |
| Best for | Portraits, events, weddings, travel | Products, art, catalogue, consistent multi-camera work |
| Cost | Low | Higher; check the current price |
How a gray card works
A gray card is a spectrally neutral surface: it reflects all colours equally, so under any light it should appear perfectly gray. If it doesn't look gray in your photo, the difference is the colour cast of your light. Correcting it to neutral corrects the whole scene shot under the same light.
Two ways to use it
- In camera (custom white balance): fill the frame with the card under your lighting and use your camera's custom or preset white balance function to measure it. The camera sets a white balance for that light.
- In editing (recommended for RAW): take one frame with the card in the scene, then use the white balance eyedropper in your editor on the card. Sync that setting to every image shot under the same light.
18% gray vs white cards: traditional 18% gray cards are used for exposure metering as well as white balance. Many white-balance cards are lighter gray or white. Both work for white balance; for exposure, follow the instructions that come with your card and remember that cameras don't all calibrate meters to exactly 18%.
How a colour checker works
A colour checker is a chart with patches of known colours: neutrals from white to black, skin-tone-like colours, primary and secondary colours, and others. You photograph it under your lighting, then use profiling software to compare the captured colours against the known values. The software builds a camera profile that shifts colours closer to the reference.
Basic workflow
- Place the chart in the scene, lit the same way as the subject, angled to avoid glare.
- Expose correctly, so the white patch isn't clipped and the black isn't crushed.
- Shoot RAW.
- In editing, set white balance using a neutral patch on the chart.
- Run the image through profiling software (usually supplied with the chart or available separately) to create a profile.
- Apply that profile to images shot under the same lighting with the same camera.
A profile is specific to a camera and lighting setup. If you change lights significantly, shoot the chart again. Many studio photographers shoot it at the start of each session as a habit.
Who needs which
Portrait and event photographers
A gray or white-balance card covers almost every need. Shoot it once per location or lighting change.
Product and e-commerce
A colour checker is worth it. Customers return items when colours don't match listings.
Art and document reproduction
A colour checker plus consistent lighting is standard practice for accurate reproduction.
Multi-camera shoots
A chart helps match different bodies so images from each look consistent side by side.
Common mistakes
- Shooting the card in different light from the subject. The card must be in the subject's light. Put it where the subject will be, facing the camera.
- Glare on the target. Reflections lighten patches and skew results. Tilt the card slightly.
- Clipped exposure. Overexposed patches can't give a correct reading.
- Mixed lighting. Window light plus tungsten lamps produce different casts on different parts of the scene. No single correction fixes both. Control the light first, then use the card.
- Old, faded or dirty cards. Targets can change colour with sun exposure and handling. Store them in their case and replace them if they're damaged or faded; manufacturers sometimes suggest replacement intervals.
- Forgetting monitor calibration. If your screen shows colours inaccurately, you'll “correct” good files into bad ones. A calibrated display is part of an accurate workflow.
Dealing with mixed and changing light
Real-world shoots rarely stay under one light. A wedding moves from a window-lit room to a tungsten-lit reception; a product shoot near a window changes as clouds pass. A simple routine keeps colour under control:
- Shoot a reference every time the light changes. New room, new time of day, new light modifier: one frame with the card.
- Name or flag reference frames so you can find them quickly when editing. Some photographers shoot the card first and then a frame of their hand to mark the start of a new set.
- Turn off competing lights where you can. It's far easier to correct one light source than to balance two.
- Gel to match if you're using flash with ambient tungsten. A warming gel on the flash brings both sources closer, so one white balance setting works for the whole frame.
- Use the card's position deliberately. If a subject's face is lit by a window and their background by lamps, place the card at the face. Skin tone usually matters most.
Using cards for video
Video shooters use gray cards to set a custom white balance before recording, since correcting baked-in white balance in compressed footage is harder than with RAW stills. Colour charts are also used in video to match cameras in post. If you shoot video with log profiles, follow the camera's recommended exposure method, which may differ from simply metering a gray card.
Practical buying checks
- Size suits your typical framing: small pocket targets for close work, larger for full-body portraits at distance.
- Matte, low-glare surface.
- A case or cover to protect it from light and scratches.
- For checkers, confirm the profiling software works with your editor.
- A lanyard hole or stand clip is handy for solo shooting.
If you're still working out RAW vs JPEG, read our RAW vs JPEG workflow guide; RAW gives you much more room to correct white balance after the fact.
FAQ
Do I need a gray card if I shoot RAW?
It's still useful. RAW lets you change white balance freely, but without a neutral reference you're guessing. One frame with a gray card gives you an exact starting point for every image under that light.
Can I use a white sheet of paper instead of a gray card?
In a pinch, it's better than nothing, but many papers contain optical brighteners that can shift colour, and white surfaces clip easily. A purpose-made neutral card is more reliable.
How often should I shoot a colour checker?
Whenever lighting or the camera changes significantly. Many studio photographers shoot one at the start of every session, and again after changing light modifiers or moving between locations.
Does a gray card help with exposure?
An 18% gray card can be used with spot or centre metering to set a reference exposure. It's helpful in tricky scenes, but modern meters and histograms often do the job well, so treat it as one tool rather than a rule.
The bottom line
If your images have the occasional colour cast, buy a gray or white-balance card and use it whenever the light changes. If you sell products, reproduce artwork or need cameras to match, step up to a colour checker and build profiles for your setups. Either way, shoot RAW and keep the target clean. When you're ready, browse gray cards on Amazon and check the current price on a size that suits your framing.