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HDR How to Photographing
14.02.2008 Category: Photography Tutorials
HDR How to
This is a detailed guide about taking photos for an HDR image. Practice has shown that successful and smooth HDR photography takes careful planning and sets certain requirements for the gear.
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Picture 1. HDR image is formed by merging several exposures.
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HDR How to Part 1: Photography Gear
The first part of this tutorial discusses photography gear. According to my knowledge it isn't possible to capture HDR photos with any of today's digital consumer cameras. Therefore the HDR image must be created by merging several normal photos. The idea is to take the same photo several times with varying exposures and merge them all to form one HDR photo. So in theory, the photos can be taken with any camera that allows manual shutter speed adjustment. The exposure between shots must be changed with shutter speed because changing the aperture would change depth of field. Many modern cameras (point and shoot, bridge, slr) have several features that make it easier to photograph for an HDR image: Manual settings Exposure bracketing (EB) Continuous shooting Timer
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Manual SettingsPhotos taken for an HDR image should be similar apart from exposure. The following camera settings should be fixed in each shot: White balance ISO sensitivity (perhaps not necessary but highly recommended) Aperture Focus Possible digital image processing operations that camera might execute (for example color correction or sharpening)
l l l l lThe possibility to turn automatism off and adjust these settings manually is good for HDR photography.
Exposure Bracketing (EB)
Exposure bracketing is a technique of taking several photos with varying exposures. A digital camera can change exposure in several ways. When it comes to HDR photography, its essential that exposure is controlled by shutter speed while keeping aperture and ISO sensitivity fixed. Other things to notice in camera's EB functionality are the amount of bracketed shots and the exposure interval. Many cameras only allow three shots with 1 EV interval. In my opinion that isn't enough for HDR photography. It's better if there is a possibility to bracket more shots or at least a possibility to increase the exposure interval. (Personally I take bracketed shots with Nikon D300 which is an ideal camera for this kind of work. Nikon D300 allows 2 to 9 shots with 1/3, 1/2, 2/3 or 1 EV intervals. I always bracket 9 shots with 1EV interval to make sure I capture the scene as well as possible.) Picture 2. Three bracketed photos with 2EV interval. (Notice that the example photo at the bottom of this HDR guide is made from 9 exposures.)
Continuous ShootingContinuous shooting means that the camera takes photos continuously while the shutter release button is held. Continuous shooting makes it possible to take bracketed shots automatically which makes HDR photography a little simpler. The faster the continuous shooting, the better the results. (Continuous shooting speed depends on the camera, storage and file format)
Timed Continuous ShootingTimed continuous shooting makes it possible to take the bracketed shots automatically and by using timer. Timed shooting removes camera shake and makes the whole process easier. To sum up, an ideal camera can use timer to automatically take many bracketed shots with adjustable exposure interval. This kind of functionality (like in Nikon D300) makes HDR photography pretty simple. Unfortunately there ...
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