How to Merge Bracketed Exposures into HDR in Lightroom – Day 11

HDR Is About Range, Not the Look It Got Famous For

Your eyes handle a far wider range of brightness than any camera sensor. Stand in a room with a window and you can see both the furniture and the view outside. Photograph it and you get one or the other — a correct interior with a blown-out window, or a good view with the room in darkness.

HDR solves that by combining several exposures of the same scene into one file that holds detail across the whole range. Day 11 covers what to do in camera, and the two-minute merge in Lightroom Classic.

The Part That Happens in Camera

Lightroom can only combine information you actually captured, so this starts before you sit down to edit.

You need at least two frames of the same scene at different exposures — typically one underexposed, one correctly exposed and one overexposed. You can dial that in by hand, but nearly every modern camera has bracketed exposure in its menus, which fires the sequence automatically. Cameras vary in what they offer; some will shoot up to nine frames across three stops.

Use a tripod if you have one. The frames get aligned and merged, so the less the camera moves between them the better the result. Without one, brace yourself properly and shoot the burst quickly — Lightroom can correct small misalignments, but it is doing repair work rather than assembly.

What You Are Starting With

In the example here there are two RAW files of the same interior. The darker frame holds the sky and the buildings through the window but the room is a silhouette. The brighter frame has a perfectly exposed room and a white rectangle where the window should be.

Neither is usable. Between them they contain everything the scene had.

Merging to HDR

1. Select your bracketed frames

   Shift-click them in the filmstrip or Grid view. Two is enough; more is fine.

2. Right-click and choose Photo Merge > HDR

   The HDR Merge Preview window opens with a live preview already built.

3. Set the options

   Covered below — the defaults are close to right.

4. Click Merge

   Processing runs in the background and the finished file appears in your catalog.

Auto Align and Auto Settings

Leave both on. Auto Align compensates for any movement between frames, which matters even on a tripod. Auto Settings applies a sensible starting tone curve to the merged file — you can change every one of those sliders afterwards, so there is no cost to letting it try.

Deghost

This is the option worth understanding. If something moved between your frames — leaves in the wind, a person shifting, water — that element sits in a slightly different place in each one, and naively blending them produces a translucent double image. Ghosting.

Deghosting tells Lightroom to pick one frame as the truth for those moving areas rather than averaging them. Medium is a good default. None is fine for a genuinely static scene; High is for obvious movement and can occasionally introduce artefacts of its own.

Create Stack

Tick it. Lightroom groups the merged file together with the source frames in your Grid view, collapsed into one thumbnail. Without it you have three loose files and no indication which belong together — and the originals are worth keeping.

What You Get Back

The result is a DNG — a RAW file, not a JPEG. That matters more than it sounds. Every bit of latitude you would expect from a RAW is still there, on top of the extra range gained from merging, so the merged file takes editing better than either original did.

Open it in Develop and the sliders are wherever Auto Settings put them. Adjust freely from there. In practice a merged HDR needs less work than a single exposure, because the hard problem — detail at both ends — is already solved.

The old reputation of HDR as garish and over-cooked came from software that tone-mapped aggressively by default. This does not do that. If your result looks artificial, it is because of what you did in the Basic panel afterwards, not the merge.

Seeing What You Gained

Select all three files, press N for Survey view and Shift + Tab to clear the panels. The two originals sit beside the merge and the comparison is immediate: one frame with a window and no room, one with a room and no window, one with both.

When This Is Worth Doing

Landscapes. Bright sky against darker land is the classic case, and bracketing costs nothing in the field.

Architecture and interiors. Any room with a window is a high dynamic range scene, and the difference is dramatic.

People, carefully. Possible if your subject holds genuinely still, but they usually do not. Deghosting helps; a single well-exposed RAW is often the safer choice.

Where This Usually Goes Wrong

Bracketing too narrowly. Frames a third of a stop apart add nothing. You want a real spread — one clearly dark, one clearly bright.

Skipping Create Stack. Three unlabelled files per scene turns into a mess within a shoot.

Deghosting set to None on a windy day. The translucent double-images are hard to fix afterwards.

Over-editing the merge. The point is natural detail everywhere. Cranking Clarity and Shadows afterwards recreates exactly the look HDR is unfairly known for.

Take It From Here

HDR is one of the few techniques where nearly all the work is in the shooting. Bracket whenever a scene has bright and dark areas you care about — it costs a couple of extra frames and gives you an option you cannot create later.

Tomorrow we look at saving your edits for reuse: how to create presets in Lightroom Classic.

Quick Reference: Keys, Menus and Settings

• Select the bracketsShift-click the frames in the filmstrip or Grid view
• MergeRight-click > Photo Merge > HDR
• Merge optionsAuto Align and Auto Settings on, Deghost Amount: Medium, Create Stack on, then Merge
• See the originalsClick the stack on the thumbnail to open it; the merge is saved as an HDR DNG
• Fine-tuneDevelop module, Basic panel: Exposure, Highlights, Shadows
• CompareSelect all three, N for Survey view, Shift + Tab to hide the panels

Shoot the brackets on a tripod if you can; Auto Align only fixes small movement.