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HDR and Linux @ Edu Pérez - Photoblog. It has been several years now since I decided to completely delete MS-Windows out of my computer at home. Now I use Linux exclusively; this operating system has given me a great flexibility and freedom in my tasks, but it has forced me to search for an alternate workflow to work with my photos. In this article, I will explain my current workflow when dealing with HDR's, using Linux and native software only. Preparing the shots Unless there is a good reason not to carry a tripod, I always use one when doing HDR. There exists software that can align the images (more on that later), but the algorithm is not perfect, and sometimes it cannot correct all the differences between shots; in those cases, halos will appear on the final result.

What I always do is shot using RAW, instead of JPEG; partially because RAW format retains more information, and partially because I prefer to do the corrections later at the computer. Unloading the images Converting to TIFF Aligning the images Exposure merge Notes. RawTherapee Blog. The GNU Image Manipulation Program. Script to make HDRs with Linux @ Edu Pérez - Photoblog. In my article HDR and Linux I explained my current work-flow to make HDRs using Linux. Still on that subject, in this article I show a script I wrote to make all that process automatic with a single call.

The source code for such script is: This script was made to be used with the RAW files generated by a Canon 400D camera, but I think it can be easily adapted to other cameras. Specifically, at "FILES=("$DIR"/*. [Cc][Rr]2)" we are selecting files with "CR2" extension, used by Canon (Nikon generates "NEF" files, by example); and the parameters "--gamma=0.45 --linearity=0.10" passed to "ufraw-batch" are specific of a 400D. I think that the rest should be generic. First of all, we must download that code to our computer and save in into a file that we can execute.

To use this script, we must first unload all the exposures from the same scene into an empty directory. Notes. Big Photo Help.