A color cast is an overall tint of one color across a photograph, so that things which should look neutral, such as white walls, gray pavement or white clothing, look orange, blue, green or magenta instead. The usual cause is a mismatch between the color of the light and the camera’s white balance setting. The fix is to shift the color in the opposite direction until neutral objects look neutral again, either in the camera or when editing.
Human eyes adapt to the color of the surrounding light, so a room lit by warm bulbs looks normal from inside it. A camera records the light as it is. That is why a cast you did not notice while shooting often jumps out of the finished picture.
Common Color Casts and Their Causes
| Cast | Typical cause | How to correct it |
|---|---|---|
| Orange or yellow | Incandescent and halogen bulbs, candlelight, warm LEDs, with a daylight white balance | Set tungsten white balance or a lower Kelvin value; move the temperature slider toward blue |
| Blue | Open shade, overcast skies, twilight, snow in shade, with a daylight white balance | Set shade or cloudy white balance; move the temperature slider toward amber |
| Green | Fluorescent tubes, some LEDs, light reflected from grass or foliage | Move the tint slider toward magenta; use a fluorescent preset |
| Magenta | Some LEDs and screens, some strong ND filters, overcorrecting a green cast | Move the tint slider toward green |
| Blue-green | Underwater, where water absorbs red light quickly with depth | Custom white balance at depth, or restore color with strobes or in editing |
| Red or magenta (old prints) | Faded color prints and film, where the cyan dye fades fastest | Restore color balance in editing |
| Yellow-brown | Some old lenses made with thorium glass, which yellows with age | Correct white balance in editing |
Light color is measured as color temperature in Kelvin. Household incandescent light is around 2700K, studio tungsten about 3200K, midday sun and flash around 5500K, and open shade on a clear day can be 7000K or more. Camera white balance presets are simply settings for these common sources. Temperature runs from blue to amber; a second control, tint, runs from green to magenta and handles the casts that fluorescent and LED lights add.
Other Causes of Color Casts
- Reflected color. Light bouncing off a colored surface takes on its color. A face near a green lawn picks up green in the shadows; a red wall warms the side of a subject facing it. These casts are local, not overall, and often look like a skin-tone problem.
- Filters. Some neutral density filters, especially strong ones, add a warm or magenta tint. Polarizing filters can shift color slightly too.
- Adapted lenses. Some wide-angle lenses designed for film rangefinders produce magenta or cyan edges on digital sensors because light strikes the sensor at a steep angle. Lens profile or flat-field correction removes it.
- Your monitor. An uncalibrated screen can show a cast that is not in the file, or hide one that is. If your prints and other people’s screens disagree with yours, see color management.
- Aging. Old color prints, slides and negatives shift color as their dyes fade. The guide to fixing colors in old photographs covers restoring them.
How to Spot a Color Cast
Find something in the picture that you know is neutral: a white shirt, a gray road, paper, a white wall, the whites of the eyes. If it shows a tint, that tint is the cast. Most editing programs show the red, green and blue values under the pointer; on a truly neutral area the three numbers are close to equal. If one channel is clearly higher, the image leans toward that color (or away from its opposite: too little blue reads as yellow, too little green as magenta, too little red as cyan).
Skin is the other giveaway. Viewers are very sensitive to skin tones, so a slight green or magenta that goes unnoticed on a landscape looks wrong on a face. Looking away from the screen for a moment and then back also helps, because your eyes adapt to a cast after staring at it.
How to Remove a Color Cast
In the camera
- Choose the white balance preset that matches the light: tungsten, fluorescent, daylight, cloudy, shade or flash.
- For more accuracy, set a Kelvin value directly, or set a custom white balance by photographing a gray card or a white card in the same light as the subject and telling the camera to use it as the reference.
- Shoot raw when you can. Raw files store white balance as an instruction rather than baking it into the pixels, so you can change it later without loss. A JPEG can still be corrected, but strong corrections cost quality; see raw vs JPEG.
When editing
- Pick the white balance eyedropper and click a neutral gray or off-white area (not a pure white highlight, which carries no color information). The editor sets temperature and tint to make that point neutral.
- Fine-tune by eye: move the temperature slider away from the cast (toward blue to cure orange, toward amber to cure blue) and the tint slider likewise (toward magenta to cure green, toward green to cure magenta).
- For stubborn casts, use the gray point picker in Levels or Curves, or adjust the red, green and blue curves individually.
- If you shot a gray card or a color chart in the first frame, correct that frame and copy the setting to every image made in the same light. See how to use a color chart.
Want to understand the settings behind the presets? White balance explains how the camera decides what neutral looks like.
Mixed Lighting: When One Correction Is Not Enough
The hardest casts come from two or more light sources of different color in one frame. A typical case is a room lit by warm bulbs around 3000K with daylight around 5500K coming through a window. Set the camera for the bulbs and the window light turns blue; set it for daylight and everything lit by the bulbs turns orange. No single white balance fixes the whole frame.
- Pick a priority. Balance for the light falling on your main subject and let the rest go warm or cool. A little warmth in the background often looks natural.
- Change the light. Turn off one source, or put colored gels over lights and windows to make them match: orange gels (often labeled CTO) make flash or daylight match tungsten, and blue gels (CTB) do the reverse.
- Correct locally. In editing, use masking or local adjustment tools to apply a different white balance to each area.
When a Color Cast Is Deliberate
Not every cast is a mistake. The warm light of golden hour and the blue of twilight are part of why those times are beautiful, and neutralizing them completely drains the mood. Many photographers warm portraits slightly or cool winter scenes on purpose, and color grading pushes this further with looks such as cool shadows and warm highlights. The difference between a cast and a grade is intent: a cast becomes a problem when it is accidental, when it fights the look you wanted, or when it makes skin look sickly. A good rule is to neutralize first, then add warmth or coolness deliberately.
Common Mistakes
- Clicking pure white with the eyedropper. Blown highlights have no color data, so the correction goes wrong. Choose a light gray or off-white with detail.
- Correcting on an uncalibrated screen. You may add a cast to fix one your monitor invented.
- Neutralizing a sunset. Auto white balance and eyedroppers can strip the warmth that made the scene worth photographing.
- Fixing only temperature. Green and magenta casts need the tint control, not the temperature slider.
- Leaving auto white balance on in tricky light. In a scene dominated by one color, such as a green forest or a red wall, auto white balance can introduce a cast of the opposite color. Set it manually.
Try This
At night, photograph a white sheet of paper on a table lit by an ordinary warm lamp, once with the daylight preset, once with the tungsten preset, and once with auto white balance. Then photograph it by a window in the shade the next day with the same three settings. Compare all six. You will see the orange cast of daylight balance under the lamp, the blue cast of tungsten balance in the shade, and where auto gets close. Finally, open the worst one and correct it with the eyedropper on the paper.
Questions About Color Casts
What causes a color cast in photos?
Most often, a white balance setting that does not match the light, such as daylight balance under warm bulbs. Reflected light from colored surfaces, filters, fluorescent and LED lighting, water and aging prints also cause casts.
How do I fix a yellow or orange cast?
Move the temperature toward blue, set the tungsten preset, or click a neutral area with the white balance eyedropper. Under warm indoor light, a setting around 2700K to 3200K usually neutralizes it.
Why do my photos look blue?
Shade, overcast skies and twilight are lit mainly by blue skylight. Use the shade or cloudy preset, or warm the temperature when editing.
Can I remove a color cast from a JPEG?
Yes, with the same white balance and curves tools, but the correction is less clean than with a raw file because the original white balance is already baked in. Large corrections can leave banding or odd colors.