In the lesson on dynamic range, you saw that some scenes are simply too contrasty for one photo: either the bright window turns white or the room turns black. Exposure bracketing and HDR are the classic solution. Instead of one photo, you take several at different brightness levels and combine the best parts. This lesson explains how bracketing works, how HDR images are made, and how to keep the result looking natural.
What is exposure bracketing?
Exposure bracketing means taking several photos of the same scene at different exposures: usually one normal, one darker and one brighter. The word comes from "bracketing" the correct exposure, placing photos on both sides of it.
Bracketing has two uses:
- Safety: in tricky light, you can choose the best single photo afterwards.
- HDR: you combine the photos so the final image has detail in both highlights and shadows.
What is HDR?
HDR stands for high dynamic range. In photography, an HDR image is made by combining several bracketed exposures into one photo that holds more range from bright to dark than a single exposure can. The darker photo provides the detail in the bright areas; the brighter photo provides the detail in the dark areas.
| Bracketed photo | What it captures well | What it loses |
|---|---|---|
| Darker (for example −2) | Highlights: the sky, a bright window | Shadows become very dark |
| Normal (0) | Midtones | May clip both ends in a contrasty scene |
| Brighter (for example +2) | Shadows: dark corners, a shaded foreground | Highlights turn white |
This builds directly on highlights, shadows, clipping and dynamic range: HDR is a way to fit a scene that is bigger than your camera's range.
Auto exposure bracketing (AEB)
Most cameras have a feature called auto exposure bracketing, often shown as AEB or BKT. You choose two things, and the camera takes the photos automatically:
- Number of frames: usually 3, sometimes 5, 7 or more for extreme scenes.
- Spacing between frames: in stops (EV). Common choices are 1 or 2 stops apart, for example −2, 0, +2.
Using continuous drive mode (burst), many cameras fire the whole set with one press of the shutter, which reduces movement between frames.
| Scene | Typical setup | Why |
|---|---|---|
| Moderate contrast (sunset with sun behind you) | 3 frames, 1 stop apart | Small extra range is enough |
| High contrast (sky and dark foreground) | 3 frames, 2 stops apart | Covers a wide range in few frames |
| Extreme contrast (dark room with sunny windows) | 5 or more frames, 1–2 stops apart | More frames cover more range |
These are common starting points from photography guides. Check the histograms: the darkest frame should not clip the important highlights, and the brightest should show detail in the shadows.
Tip:Bracket in Aperture Priority or Manual so the camera changes the shutter speed between frames and keeps the aperture the same. If the aperture changed, the depth of field would differ from frame to frame.
Merging into an HDR image
- Shoot the bracket, ideally in RAW and on a tripod so the frames line up.
- Load the photos into editing software with an HDR merge feature, such as Lightroom's Photo Merge HDR or similar tools.
- Turn on alignment and de-ghosting if something moved or the camera shifted slightly.
- Edit the merged file carefully, keeping it natural.
Many cameras and almost all phones also have a built-in HDR mode that does the merging for you and saves one JPEG. It is quick and convenient but gives you less control. Phones often do this automatically without you noticing, as you will learn in computational photography.
Ghosting: the problem with movement
HDR assumes the frames are identical except for brightness. If something moves between frames, such as a person walking, leaves in the wind, or waves, it appears in different places in each frame. When merged, it can look like a see-through ghost. This is called ghosting.
- Shoot the bracket as fast as possible, in burst mode.
- Use the de-ghosting option in your software.
- Avoid HDR for scenes with a lot of movement, or wait for a pause.
Natural HDR versus overcooked HDR
HDR has a bad reputation because of photos with glowing halos around buildings, gray skies, and colors that look fake. This comes from heavy editing after the merge, not from bracketing itself. A good HDR photo usually does not look like HDR at all; it simply looks like what your eyes saw.
| Natural HDR | Overcooked HDR |
|---|---|
| Bright areas still look brighter than dark areas | Everything looks the same brightness |
| Clean edges between sky and buildings | Glowing halos along edges |
| Realistic colors | Oversaturated, cartoon-like colors |
When not to bracket
You do not need HDR for every photo. If the histogram shows no important clipping, one well-exposed RAW file is enough. Many scenes can also be solved more simply by changing position or adding light, as described in the dynamic range lesson. Use bracketing when the contrast truly demands it. Advanced bracketing and HDR capture are covered later in exposure bracketing and high dynamic range capture.
Common mistakes
- Bracketing in Shutter Priority: the aperture changes between frames, so sharpness differs.
- Handheld brackets in low light: frames shift and blur; use a tripod or a faster burst.
- Too little spread: if the darkest frame still clips the sky, the HDR cannot recover it.
- Over-editing the merged file: the halos and fake colors that give HDR a bad name.
How professionals use bracketing
Real-estate and interior photographers bracket almost every room, because windows are far brighter than the inside. Landscape photographers bracket at sunrise and sunset when the sky is much brighter than the land. Event photographers rarely use HDR, because people move. In every case, professionals aim for a merged image that looks believable, and they check the darkest frame for safe highlights before moving on.
Practical examples
A living room with bright windows
- Situation
- You photograph a living room for a rental listing; the windows are bright, the corners are dark.
- What to do
- On a tripod, you shoot 5 frames 2 stops apart and merge them.
- Why it works
- The room and the view outside differ by more than one photo can record.
- Result
- The room is detailed and the garden is visible through the windows, looking natural.
Sunrise over hills
- Situation
- The sunrise sky is very bright while the hills below are in shadow.
- What to do
- You shoot 3 frames 2 stops apart in Aperture Priority at f/8.
- Why it works
- The darker frame keeps the sky's color; the brighter frame shows the hills.
- Result
- A merged image with a glowing sky and detailed hills, with the same depth of field in every frame.
Key points
- Bracketing means taking the same photo at several exposures, darker and brighter.
- HDR combines bracketed photos so highlights and shadows both keep detail.
- AEB takes the bracket automatically; 3 frames 2 stops apart is a common start.
- Use a tripod and keep the aperture fixed; movement between frames causes ghosting.
- Edit merged images gently; bracket only when the contrast truly needs it.
Frequently asked questions
What is exposure bracketing?
What is HDR photography?
How many photos do I need for HDR?
What is ghosting in HDR?
Conclusion
Bracketing and HDR let you capture scenes that are too contrasty for one photo. Use a tripod, fix the aperture, check the darkest and brightest frames, and edit the result gently so it looks real. Next, you will learn how to keep your images clean by reducing noise.
Finished reading? Track your progress through Exposure and metering.