About the HDRMerge category

HDRMerge combines two or more raw images into a single raw with an extended dynamic range. It includes a GUI to remove ‘ghosts’ from the resulting image. Please read this short notice before posting.


HDRMerge can import any raw image supported by LibRaw, and outputs a DNG 1.4 image with floating point data. Programs which support these HDR DNGs:

The RawTherapee developers @Morgan_Hardwood and @heckflosse have graciously started helping out Javier Celaya with the project.


  • Downloads and Documentation: HDRMerge
  • Forum: you’re here. Or more specifically, you’re in the HDRMerge category of this shared forum. Other libre graphics software share this forum too, so make sure you post in the right category! Use the forum for user support and discussion, do not file bug reports or make feature requests in the forum.
  • Report bugs and make feature requests in GitHub: Issues · jcelaya/hdrmerge · GitHub
    Make sure to provide the necessary information: which version of HDRMerge you’re using, the full contents of any error messages, and a download link to your raw files.