Northern lights HDR photography

Northern lights HDR photography

Northern Lights HDR Photography

HDR exposures

HDR means ‘High Dynamic Range’. Multiple exposures are combined to give the result that a single exposure couldn’t achieve. For northern light photography, the HDR technique means that you can include rich landscape or even foreground to make the scene more dynamic. The technique requires some practice and some experience because it goes beyond the Night Photography Basics and generally requires professional camera gear for really good results. Because the sequence of exposures is time consuming, it is essential to have your composition good to start with. I look for some water if possible for reflected light and shapes that might help the scene. It is fine to follow the basic rules of composition such as ‘Symmetry’ or the rule of thirds.

For this scene, I actually took a 3 exposure HDR. The first exposure was for the sky for 25 seconds, then the landscape for 225 seconds then the lights on the lighthouse for just 1 second. This final exposure was never used in the final image, so this is a 2 exposure HDR.

How to photograph the Northern Lights.

Here is the unprocessed 225 sec exposure open in Lightroom so you can see the histogram. From the histogram, I can see that all the shadows are preserved which means we I have processing control.

Exposing for the shadows Northern lights HDR

225sec Exposing for the shadows. The histogram tells me that I have all the shadow data.

Lightroom shadow adjustment

All of the shadows are included in the exposure, so I can go ahead and increase the levels of the shadows by boosting shadows and blacks. Then using de-haze to introduce contrast I maintained a ‘Night Look’.

LR shadow adjustment

Shadow levels increased with shadow and black slider.

The 25 second sky exposure was given a similar treatment in light room to boost the shadows in the sky to give a better print.

Lightroom adjust aurora sky

Increasing shadows in the sky.

Photoshop Layers

The next step is to open both images as layers in Adobe photoshop. It is possible to open both files as layers, but I just open both files and used Select all > Copy > paste to add 1 image as a layer on top of the other. I selected the brighter pixels in the top layer (brighter image) by using ‘Ctrl+Alt+2’ to select the highlights, then holding shift, I was able to add to the selection until the whole sky was selected.

Layers in photoshop

With the brighter image on top, I used ‘Ctrl+Alt+2’ to select the highlights.

With my selection, I click the Mask Icon to turn the selection into a mask. Then I invert the mask (Ctrl+i) to allow the highlights from the bottom layer replace the highlights in the top layer. There are ‘High Dynamic Range’ software programs, such as Photomatix that will merge the different exposures automatically. In Photoshop and Lightroom it is also possible to merge exposures automatically.

Highlight mask photoshop

The highlight mask is inverted to reveal 2 perfectly blended exposures.

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