“Die Hard” HDR’s possible with Open Source Software ?

See also @ Flickr : https://www.flickr.com/photos/pentaxianbelgium/16878789781/ Yard cranes. Yet another “die hard” HDR. Partly developed with RawTherapee 4.2.73 HC ( Hald CLUT – http://www.digicrea.be/downloads/my-downloads/ ) to TIFF – only exposure and auto levels. Sometimes i use the graduated filter to make the sky more dramatic, and start tone mapping beforeā€¦

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