Exposure Blending with digiKam

No matter how good your camera is, taking a well-exposed photo of a high-contrast scene like a black bird on snow can be really tricky. Even if you switch to the manual mode and tweak the exposure settings, there is still a risk that you will end up with a shot containing under- or overexposed areas. One way to solve this problem is to use exposure blending. This technique involves taking several shots of the same scene or subject with different exposures and then fusing these shots into one perfectly exposed photo.

While exposure blending sounds simple in theory, achieving usable results can be a rather laborious and time-consuming process. Fortunately, digiKam can do the donkey job for you thanks to an exposure blending tool bundled with the Kipi plugins. The exposure blending tool relies on the hugin application for processing and fusing photos, so you must install it on your machine beforehand. On Ubuntu, this can be done using the sudo apt-get install hugin command.

To keep things tidy, move the photos you want to blend into a separate album, select them using the Ctrl+A keyboard shortcut, and choose Tools | Blend bracketed images. This opens the Exposure Blending Import wizard that guides you through the entire process. In the Set Bracketed Images window, add other photos if needed, and remove and rearrange the photos that are already in the list. Hit then the Next button to move to the next step. digiKam can align the selected photos before blending them. This feature can come in handy if you took the photos without a tripod. If this is the case, tick the Align bracketed images check box, and press Next to start the pre-processing. Once digiKam is done, press Finish, and you will be automatically dropped into the Exposure Blending editor.

Hit the Preview button to see the blended photo in the preview pane. If you are not satisfied with the result, you can tweak the available options, including exposure, saturation, and contrast. You can also exclude individual photos from the stack to improve the blending result. The clever part is that every time you tweak the settings and press the Preview button, digiKam generates a preview image which you can compare with the previous versions. You can then save all the generated versions, or save only the one you like most.

Although digiKam’s exposure blending tool is not the most powerful or flexible solution out there, it is capable of producing rather impressive results, especially if you are not afraid of getting your hands dirty with manually tweaking the final results.

Tech writer covering Linux and open source software

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Posted in Open Source, Photography, Software
4 comments on “Exposure Blending with digiKam
  1. Yuriy says:

    Wow thank you!

    I’ve been wondering where/if this feature is in Digikam but never really looked. This sounds really neat, and more automated than I expected, especially if it can really align things well. I’ll give it a try soon.

  2. Zack Evans says:

    I was playing with this last night, impressed it works at the technical level, but…

    Is there a simple explanation anywhere of what the sliders do? I thought exposure would be exposure comp and contrast would be, um, contrast, but doesn’t seem to work quite like that!

  3. Bryce Schober says:

    My windows digikam can’t find hugin, even though I’ve installed the latest, added its bin directory to my path, and even tried copying it into the kde\bin directory. Any suggestions?

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