HDRMerge is a simple application for Linux which can be used to turn your ordinary images into High Dynamic Range ones. Its a pretty simple application designed for Photographer but also suitable for daily use. HDRMerge supports various raw images from many digital camera brands. Its not as good as HDRMerge or Photomatix Pro but at least it can improve your photos into something more dynamic.
For more information, please visit the HDRMerge project here. This tutorial will show you How to install HDRMerge 0.4 on Ubuntu 14.04 Trusty Tahr. To install open Terminal and paste these commands:
sudo add-apt-repository ppa:dhor/myway
sudo apt-get update
sudo apt-get install hdrmerge