Download of HDRMerge 0.5.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X was originally created by Javier Celaya. The software is categorized as Design & Photo Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
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.
You may want to check out more Mac applications, such as QuickShow OSX, Stone Studio or Dock Icon Viewer, which might be related to HDRMerge.
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