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Thread: how to do HDR photography with open source?

  1. #1
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    how to do HDR photography with open source?

    I have tried to do it manually with the GIMP but I'm not really satisfied with the result. Does anybody know of a program for making HDR compositions from several photographies?
    tutorials?
    thanks

  2. #2
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    Re: how to do HDR photography with open source?

    hi,

    I recently wondered about the same issue.

    And found these two applications:

    • ufraw to open raw files and
    • Qtpfsgui (what a name!) for creating hdr images

    Both can be installed via the terminal:
    Code:
    sudo apt-get install ufraw qtpfsgui
    Just started with digital photography (Nikon D40 ), so I am not that much into it by now.
    Keep it real. Keep it nice.
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  3. #3
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    Re: how to do HDR photography with open source?

    thanks Michael
    Qtpfsgui's interface has improved a lot since the last time I tried using it (about a year ago). This time I was able to produce an interesting looking results with a few clicks while the last time I couldn't get it to work. I will definitely explore its many options

  4. #4
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    Re: how to do HDR photography with open source?

    According to this page, the pano-stitcher Hugin can also do HDR:
    http://wiki.panotools.org/Hugin_Stitcher_tab

    I know hugin has an option to create multi-layer tiffs. You can then load it into GIMP and manually create layer masks to blend the images. According to the webpage above, Hugin also has options to attempt this automatically.

    The hugin package is in the official repos.

    I've never used qtpfsgui, so I don't know how the results compare.

  5. #5
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    Re: how to do HDR photography with open source?

    It's hard to get good results in gtpfsgui. To improve on the default tonemapping options you can try the Fattal plus Drago method.

    There is a full tutorial on this somewhere on the web, but in short...
    - First tonemap using default Fattal settings, then create second tonemap using Dragal.
    - Second, open both images in gimp as layers, put Drago on the bottom, then overlay the Fattal image on top at about 70% (or however you like it).
    - Third, merge your visible layers back into one image, or save as an xcf to preserve the two layers.

    Post your results if you get a good one. I have yet do make a great HDR on linux...


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  6. #6
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    Re: how to do HDR photography with open source?

    @cubeist: thanks for the instructions. I followed them, and I'm posting the result as a reference.
    Attached Images Attached Images

  7. #7
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    Re: how to do HDR photography with open source?

    Hugin works great for stitching photos. I have gotten good results with manual control points. For exposure, Hugin has decent tools for correcting exposure across a panorama. An HDR is a special panorama with different exposures for the same scene. Hugin can handle 48-bit color space and has special exposure blending filters, but I haven't tried any HDR's with it.

    It would be interesting to see the exposure series of the fountain so we could see the over and underexposure range.

    I still find it fascinating that our eyes can capture ~18 stops of light, yet digital photography is pressed to capture 6.

    Let us know what works.
    Last edited by tgalati4; June 27th, 2009 at 08:29 PM.
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  8. #8
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    Re: how to do HDR photography with open source?

    I use qtpfsgui and gimp in the following steps.
    9 out of 10 people prefer the less is more look.

    1, minor colour alteration in G.I.M.P.
    2, Create HDR in QTPFSGUI and save.
    3, create a tone map using mathiuk formula and save.
    4, create a tone map using fattel formula and save.
    5, open mathiuk file in G.I.M.P.
    6, Open fattel file in G.I.M.P and paste as a new layer into the mathiuk file,
    7, set layer mode to Multiply.
    8, merge layers
    9, adjust finial colours
    10, save image,
    11, upload to photo bucket,
    12 Post up on this forum as a thank you to everyone who helped me out.


  9. #9
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    Re: how to do HDR photography with open source?

    Quote Originally Posted by perroazul View Post
    @cubeist: thanks for the instructions. I followed them, and I'm posting the result as a reference.
    I think it is a good result, but the whites are a little bright.

    @ AJB2K3:
    Fattal and Mantiuk, interesting, I have never seen this combo before, but it does give a nice subtle result. Good job.

    If I can ever find more hours in the day I will write a gimp plugin for both methods.


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  10. #10
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    Re: how to do HDR photography with open source?

    Quote Originally Posted by cubeist View Post
    I think it is a good result, but the whites are a little bright.

    @ AJB2K3:
    Fattal and Mantiuk, interesting, I have never seen this combo before, but it does give a nice subtle result. Good job.

    If I can ever find more hours in the day I will write a gimp plugin for both methods.
    Thanks, it was a tip I found on the qtpfsgui site as I couldn't get a good composition with the single filters.

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