Not long ago I wrote about Four of the Latest Updates to Lightroom Classic CC. In it, we talked about some of the fresh features Adobe has recently added to Lightroom. One of those great new additions was the single-step HDR Panorama Photo Merge. That’s a mouthful of a name, but it’s an incredibly useful tool that allows us to combine multiple bracketed exposures into a seamless high dynamic range panoramic image in, as the name suggests, essentially a single step. In this article, we’re going to delve a little deeper into the new single-step step HDR Panorama Photo Merge (geez) feature and show you exactly how to capture and combine your images to make a beautifully executed panorama.
What is an HDR Panorama?
High dynamic range (HDR) photographs and panoramas are nothing new to the world of photography. In fact, neither are HDR panoramas.
HDR photos are simply images combining multiple exposures to form a final photo that exhibits tonal and/or focus ranges far beyond a single exposure. Along those same lines, panoramic photos are images stitched together that carry a visual perspective beyond what is obtainable from a single exposure (with a few exceptions).
As you may have guessed, an HDR panorama combines multiple photographs to produce a wide perspective composite image featuring high dynamic range.
Previous methods for merging multiple images to produce HDR panoramic photos were generally tedious and required venturing over into Photoshop. Luckily, with the new HDR Panoramic feature introduced in v8.0 of Lightroom Classic CC, you can now efficiently combine your images with just a few clicks of the mouse. Let me show you how I made the above HDR pano combining twelve separate bracketed photos right inside of Lightroom.
Obtaining your images for merging
The first and arguably most crucial part of creating your HDR panorama begins inside your camera.
Lightroom places some stringent criteria on the images you can combine using it’s single-step HDR Panorama function. ALL of these rules must be met by each one of your images prior to merging.
Here are the “rules” for images you plan to merge into an HDR pano directly from Adobe:
- All the images in your selection must contain the exposure metadata – Exposure time, f-number, and ISO.
- Each set of bracketed exposures in your selection must have the same number of images. For example, if you chose to bracket with three images, then all the sets in the selection must also use three images.
- Every set of bracketed exposures in your selection must have the same exposure offsets. For example, if your first set has exposure offsets of (0, -1, +1), then all other sets in the selection must follow the exposure offset pattern. The image sets can have different exposure values; only the exposure offsets pattern must be consistent across all the sets.
- Each set of bracketed exposures must be captured contiguously. For example, if you’ve considered a bracket size of three while capturing the images, then the first three images in the sequence become part of a bracket set. The next three images in the sequence become part of another bracket set, and so on.
- Within a set of bracketed exposures, the images must not have the same exposure value.
While you can shoot your images in either a vertical or horizontal orientation, it is a good idea to use vertically orientated photos in you plan on displaying them digitally. This avoids extremely long, yet narrow images. Of course, this is entirely up to you.
Combining the images
Now that you’ve made it through the rather exacting process of actually obtaining your photos for merging, the rest of the operation is refreshingly easy to complete.
First things first. In the Library Module of Lightroom Classic CC select the images you want to use for the HDR pano. An easy trick to select all of your images at once is to select the photo at the beginning of the series and then hold down the shift key while clicking the last photo in the series. This automatically selects all your bracketed exposures at once. It also saves you quite a few mouse clicks if you are using a high number of photos.
Once you’ve got all of your photos selected, right-click on any of those images and choose Photo Merge, and then HDR Panorama.
It’s here where you learn for sure whether all of your images meet the requirements for merging. If not, you will receive the soul-crushing message ‘Unable To Detect HDR Exposure Bracket Size. Merge To Non-HDR Panorama Instead?’ That means Lightroom will merge the photos into a normal non-HDR pano if possible.
However, if you’ve done your duty, and you obtained all of your images correctly, your photo will appear as a preliminary smart preview. From here, it’s just a matter of controlling how you want Lightroom to handle the final merging of your images. You’ll have quite a few options that will affect the ultimate product.
Think of projections as the shape of the canvas on which Lightroom paints your finished HDR panorama. There are three different projection modes from which to choose based on the nature of the panorama you are creating:
- Spherical: This aligns and transforms the images as if they were mapped to the inside of a sphere. This projection mode is great for ultra-wide or multi-row panoramas.
- Cylindrical: This projects the panorama/HDR panorama as if it were mapped to the inside of a cylinder. This projection mode works well for wide panoramas, but it also keeps vertical lines straight.
- Perspective: This projects the panorama/HDR panorama as if it were mapped to a flat surface. Since this mode keeps straight lines straight, it is great for architectural photography. Extremely wide panoramas may not work well with this mode due to excessive distortion near the edges of the resulting panorama.
The amount of Boundary Warp is a way to stretch your merged HDR pano so that it more or less fills the frame of the selected projection mode. With Boundary Warp, you have a slider that ranges from 0-100 that allows you to preserve any content of the photo that you may lose after cropping.
Experiment with different Boundary Warp settings until you reach a happy medium between distortion and content preservation.
These settings work extremely well to save you some editing time at least on the front end. The auto-crop and auto-settings functions allow Lightroom to trim and process your finished HDR panorama automatically. While you, of course, can crop and process your image manually after merging, I’ve found the auto settings function gives consistently outstanding results.
Consider stacking as an afterthought of your post-panorama post-processing. It’s a way for you to keep all of your ducks in a row, so to speak, and is especially useful if you’ve used many photos to construct your HDR panorama. Choosing the stacking option literally stacks all of the images used for your HDR panorama merge into a group with the merged image placed on top. This aids in keeping your filmstrip tidy and saves physical space in the Library Module.
Once you have made all of your selections for the HDR pano merge, it’s time to click the ‘Merge’ button. This begins the process of combining the images into a single DNG file.
After the merge is complete, you will have an image which you are free to finish processing just as you could with any other digital RAW file. This includes adjusting the auto-cropping and, of course, the auto settings. This achieves the final image that we saw from earlier.
Remember that any HDR image is already by its very definition a composite photo. As such, it is a combination of many different exposures which, if pushed too far, can result in an incredibly fake-looking final product. Always keep your HDR images within the realm of passable reality unless you are intentionally going for a hyper-realistic appeal. Along those same lines, make sure the photos meet all the criteria for HDR panorama merging listed above.
Furthermore, attempt to previsualize the final merged photo in your mind and shoot your images according to the tonal range and perspective you wish to achieve. When in doubt, it’s always better to have too many images to work with than not enough.
Have some HDR Panorama photos you’ve created inside of Lightroom Classic CC? We’d love to see them! Feel free to share them in the comments.