HDRMerge – combine raw images into a single raw with an extended dynamic range

HDRMerge combines two or more raw images into a single raw with an extended dynamic range.

It can import any raw image supported by LibRaw, and outputs a DNG 1.4 image with floating point data. The output raw is built from the less noisy pixels of the input, so that shadows maintain as much detail as possible.

HDRMerge has both a graphical (Qt 5) and a command line interface. The GUI contains a set of edit tools that allow you to decide what part of each image gets into the final output. This is mainly useful to remove ghosts created by moving objects between images. I

Features include:

  • Supports most raw format supported by LibRaw.
  • Automatic alignment of small translations.
  • Automatic crop to the optimal size.
  • Automatic merge mask creation. The mask identifies the best source image for each pixel of the output.
  • Editable merge mask, to manually select pixels from specific source images.
  • Writes DNG files with 16, 24 and 32 bits per pixel.
  • Writes full, half or no preview to the output image.
  • Copies the EXIF data from the least exposed source image.
  • Disable alignment and/or cropping. This is most useful to obtain an image of the same size as the inputs.
  • Batch mode in command line. Merge several sets of HDR images at once.
  • Support for CYGM and Fujifilm X-Trans sensors (experimental).
  • Cross-platform support – runs under Linux and Windows.

Website: jcelaya.github.io/hdrmerge
Support: Manual, GitHub Code Repository
Developer: Javier Celaya and contributors
License: GNU General Public License v3.0 or (at your option) any later version


HDRMerge is written in C++. Learn C++ with our recommended free books and free tutorials.

Return to HDR Imaging Home Page

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