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Download Merge Plugin

Merge to 32-bit HDR Plugin for Lightroom


The Merge to 32-bit HDR Plugin requires Lightroom 4.1 or higher. It will not work in Lightroom 3 or earlier.


Merges bracketed photos into a Floating Point TIFF file ready for Tone Mapping in Lightroom Develop module.

This plugin does not offer Photomatix HDR Tone Mapping. If you want to use Photomatix from Lightroom, please use the Export to Photomatix Pro Plugin instead, which is included for free in Photomatix Pro.

Download Links

Download the Plug-in by clicking one of the links below depending on your OS:

Merge to 32-bit HDR Plug-in 1.1 for Windows 64-bit  (Vista 64-bit / 7 64-bit / 8 64-bit)

Merge to 32-bit HDR Plug-in 1.1 for Windows 32-bit  (Vista 32-bit / 7 32-bit / 8 32-bit)

Merge to 32-bit HDR Plug-in 1.1 for Mac OS X  (10.5 / 10.6 / 10.7 / 10.8 / 10.9)

Using the Plug-In

  1. After installation, restart Lightroom if you are on Windows (or used the installer on Mac)
  2. Select bracketed photos from either the Filmstrip or the Grid.
  3. Right-click to invoke the contextual menu.
  4. Select Export and then Merge to 32-bit HDR
  5. Select the desired options and click on the Merge button
  6. In case the merged image does not show once the merge has completed, click above the filmstrip and check All Photographs.
  7. You can then adjust the merged image in Lightroom's Develop module.

Important Note

The Merge to 32-bit HDR Plug-in for Lightroom is not related to the Photomatix Pro, Photomatix Essentials or Photomatix HDR Plug-in for Aperture products.

Images merged with the Merge to 32-bit HDR Plug-in are processed by Lightroom and not Photomatix. Images shown in the user gallery of the HDRsoft.com website are not done with the Merge to 32-bit HDR Plug-in.

Merging to 32-bit HDR without the Plug-in

    Photomatix Pro can already merge to HDR to create a 32-bit HDR file accepted by Lightroom as described below. The Merge to 32-bit HDR Plug-in for Lightroom adds convenience, but is not necessary if you have Photomatix Pro.

  1. Open Photomatix Pro and click on the Load Bracketed Photos button.
  2. On the dialog to load the photos, check the Show intermediary 32-bit HDR image box.
  3. Select the desired option on the Pre-Processing Options dialog, and click OK
  4. Once the merge is completed, choose File > Save As....
  5. Select the Floating Point TIFF (.tif) item on the File Format combo-box and click OK.
  6. Import the saved TIFF file into Lightroom.

Update log

9-Mar-13 - Updated in v1.1
  • Bug fixed: In Lightroom 4.4, the merged TIFF files created by the plugin were dark and looked "wrong".
  • Added Deghosting Strength setting (referred to as "Detection" in Photomatix).
  • Added German localisation
  • Moved the listing of the plugin on the contextual menu to an 'HDRsoft' submenu instead of 'Photomatix'.
  • Bug fixed: Camera model metadata was not correct when merging photos from the Fuji X10.
  • Bug fixed: On Lightroom Export panel, the Preset for the Merge to 32-bit HDR Plugin included the File Naming and Image Setting sections whereas there was no need for them.
  • Bug fixed: License key was still showing on Plug-in Manager dialog after plugin had been unregistered on computer (by removing Registry setting on Windows or Preferences file on Mac)