There will often be a chromatic aberration removal option too. HDR merge tools will typically offer optional auto alignment, ghost reduction and chromatic aberration reduction as part of the merge process. The software will typically select a single frame as a reference and suppress or hide any movement in the other frames. You might have pedestrians walking in front of the camera or leaves blowing in the wind. The ghosting option is to take care of any movement in the scene between exposures. The classic HDR technique is to shoot the scene using a series of different exposures and merge them using HDR software. If you used a tripod you won’t need this, but if you shot your exposure series handheld, you will need to rely on the software to line up the shots precisely. HDR tools usually offer three additional options for the merging process. They all work on broadly the same principle (Skylum Aurora HDR is being used for these examples). There are a number of dedicated HDR plug-ins and apps on the market and some image editors offer HDR merging tools built in. The usual HDR technique is to take a series of the scene at different exposures and merge them using HDR software. This shot is a good candidate for HDR, since there’s no single exposure which will be ab le to capture detail in the darkest shadows of this building’s wooden rafters and the bright sky outside. Much of the time your camera’s 12-stop dynamic range ‘window’ is much wider than the scene you’re photographing, but sometimes the scene’s dynamic range is wider than your sensor’s and if you need to maintain detail in the highlights and shadows, this is when you need HDR techniques. This is measured in f-stops or EV values, and digital camera sensors can typically capture up to 12 stops of dynamic range. HDR is a technique for capturing scenes with a very high brightness (dynamic) range. The screenshots used here are from Aurora HDR 2019.
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