How to Create HDR Panoramas with Automation Scripts

Creating a high dynamic range (HDR) panorama involves capturing bracketed exposures across a panoramic field of view, batch-merging those brackets into individual HDR frames, and stitching those frames into a single, seamless wide-angle image. By utilizing automated scripts in software like Adobe Photoshop, Lightroom, or specialized panorama tools, you can eliminate the tedious manual labor of merging dozens of exposure brackets one by one, producing a high-fidelity image with balanced highlights and deep shadow detail in a fraction of the time.

1. Capture the Source Images Correctly

To ensure automation scripts work properly without alignment errors, capture your images with strict consistency:

  • Mount your camera on a sturdy tripod, preferably with a panoramic head aligned to the lens's nodal point.
  • Set the camera to full Manual mode (fixed aperture, white balance, and focus).
  • Use exposure bracketing (AEB), capturing 3 to 5 exposures per angle (e.g., -2 EV, 0 EV, +2 EV) while varying only the shutter speed.
  • Overlap each angle by at least 30% to 40% horizontally.

2. Organize Your Files for Batch Processing

Automation scripts rely on predictable file structures. Sort your images into a single directory and verify that the bracket count per angle is identical. For instance, if you take 3 exposures across 5 panoramic angles, you must have 15 evenly sequenced files.

3. Automate the HDR Merge

Instead of manually opening each set of brackets, use an automated merge script to create the intermediary 32-bit HDR files:

  • In Adobe Lightroom Classic: Select all bracketed photos in the grid view. Right-click, navigate to Photo Merge, and choose HDR Panorama. Lightroom includes an integrated script that bypasses the two-step process, automatically detecting brackets, generating HDR files, and stitching the panorama in one background operation.
  • In Adobe Photoshop (Two-Step Automation):
    1. Go to File > Automate > Exposuremerge (or Merge to HDR Pro via Bridge).
    2. To process multiple sets automatically, use Adobe Bridge: select your bracketed sets, go to Tools > Photoshop > Process Collections in Photoshop, or run an action script recorded to load and merge sets of files into 32-bit .exr or .tif files.
  • In Dedicated Tools (e.g., PTGui Pro): Drag all raw files directly into the software. The program will automatically detect the bracketed sets based on EXIF exposure data and prompt you to enable HDR mode, aligning and merging all brackets simultaneously.

4. Automate the Panoramic Stitch

If your software did not stitch the panorama during the HDR merge step, you now stitch the resulting 32-bit HDR images:

  1. Open Photoshop and navigate to File > Automate > Photomerge.
  2. Set the Layout to Auto (or Cylindrical / Spherical depending on the field of view).
  3. Check Blend Images Together and Geometric Distortion Correction.
  4. Browse and select all the merged 32-bit HDR TIFF files generated in the previous step.
  5. Click OK to let the script project, blend, and stitch the HDR plates into a single canvas.

5. Tone Map and Export

Once the script completes the stitch, crop out any uneven edges using the Crop tool. Because the document retains full 32-bit dynamic range, apply tone mapping through Image > Adjustments > HDR Toning or use the Camera Raw Filter to balance the exposure, recover sky highlights, lift shadows, and export your final high-resolution panorama.