How to Make an HDR Photo in GIMP with the Exposure Blend Plugin

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HDR Photos with Exposure Blend GIMP Plugin

HDR photography has become very popular over the last few years and I'll show you how to make an HDR photo in GIMP in this step by step tutorial. If you're not familiar with HDR, the acronym stands for High Dynamic Range and refers to producing photos with a wider range of lighting than a digital camera can currently capture in a single exposure.

If you've ever taken a photo of people stood in front of a light sky, you'll probably have seen this effect with the people appearing to be well lit but the sky being near to a pure white. If the camera produced a photo with the sky appearing with its true color, you would see that the people in the foreground looked too dark. The idea behind HDR is to combine the two photos, or indeed many more photos, to create a new photo with both the people and the sky correctly exposed.

To make an HDR photo in GIMP, you need to download and install the Exposure Blend plugin produced originally by JD Smith and further updated by Alan Stewart. This is quite a straightforward plugin to use and can produce a relatively good result, though it's not as rounded as a true HDR app. For example, you're limited to just three bracketed exposures, but this should be sufficient in most cases.

In the next few steps, I'll run through how to install the Exposure Blend plugin, combine three different exposures of the same shot into one photo and then tweak the final photo to fine tune the result. In order to make an HDR photo in GIMP, you'll need to have three bracketed exposures of the same scene taken with your camera mounted on a tripod to ensure that they'll align perfectly.

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Install the Exposure Blend Plugin

You can download a copy of the Exposure Blend plugin from the GIMP Plugin Registry.

After downloading the plugin, you will need to place it in the Scripts folder of your GIMP installation. In my case, the path to this folder is C: > Program Files > GIMP-2.0 > share > gimp > 2.0 > scripts and you should find it to be something similar on your PC.

If GIMP is already running, you'll need to go to Filters > Script-Fu > Refresh Scripts before you can use the newly installed plugin, but if GIMP isn't running, the plugin will automatically install when it's started next.

With the plugin installed, in the next step I'll show you how to use it to create a blend of three exposures to make an HDR photo in GIMP.

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Run the Exposure Blend Plugin

This step is to simply let the Exposure Blend plugin do its thing using the default settings.

Go to Filters > Photography > Exposure Blend and the Exposure Blend dialog will open. As we're going to use the plugin's default settings, you only need to select your three images using the correct select field. You just need to click on the button beside the Normal Exposure label and then navigate to the specific file and click open. You will then need to select the Short Exposure and Long Exposure images in the same way. Once the three images are selected, just click the OK button and the Exposure Blend plugin will do its thing.

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Adjust Layer Opacity to Tweak the Effect

Once the plugin has finished running, you'll be left with a GIMP document that consists of three layers, two with layer masks applied, that combine to produce a complete photo that covers a wide dynamic range. In HDR software, Tone Mapping would be applied to the image to strengthen the effect. That isn't an option here, but there are a couple of steps that we can take to improve the image.

Often at this stage, the HDR photo can appear a little flat and lacking in contrast. One way to counter this is to reduce the opacity of one or two of the upper layers in the Layers palette, to reduce the effect that they have on the combined image.

In the layers palette, you can click on a layer and then adjust the Opacity slider and see how this affects the overall image. I reduced both of the upper layers by 20%, more or less.

The last step will increase contrast a little more.

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Increase the Contrast

If we were working in Adobe Photoshop, we could easily increase the contrast of the image using one of several different types of adjustment layers. However in GIMP we don't have the luxury of such adjustment layers. However there's more than one way to skin a cat and this simple technique for enhancing shadows and highlights offers a degree of control using the layer opacity control that was applied in the previous step.

Go to Layer > New Layer to add a new layer and then press the D key on your keyboard to set the default foreground and background colors of black and white. Now go to Edit > Fill with FG Color and then, in the Layers palette, change the Mode of this new layer to Soft Light. You can see the Mode control marked in the accompanying image.

Next add another new layer, fill this with white by going to Edit > Fill with BG Color and again change the Mode to Soft Light. You should now see how these two layers have considerably strengthened the contrast within the image. You can tweak this though by adjusting the opacity of the two layers if desired and you can even duplicate one or both of the layers if you want an even stronger effect.

Now that you know how to create HDR photos in GIMP, I hope you'll share your results in the HDR Gallery.