Walt Disney World in HDR
With the advent of more powerful personal computers, digital cameras and imaging software, photographers and software engineers created the HDR process of merging a set of digital photographs which would have taken hours of setup in a darkroom and do it in just a few minutes. Today’s blog is just an introduction to HDR as I have recently discovered it myself.
There are two kinds of HDR images. One is created by a set of images I call an HDR set. The second is created from one image which I will cover in three weeks. So, what is an HDR set? To explain that I first have to introduce you to the term bracketing. In photography, bracketing means to take one picture at a given exposure then one or two brighter and one or two darker, in order to obtain the best image. I did this often whenever I was using slide film. Digital sensors are a lot like slide film so when I took up digital photography, I returned to bracketing, especially if the the subject I was photographing had very light and dark areas.
HDR imaging takes bracketing a bit further. Instead of changing a half or a full stop around an exposure, HDR photographers go 2, 3 and sometimes more stops. Digital cameras make it very easy as most come with auto-bracketing settings which will program your camera to take a series of photos plus and minus around the exposure the photographer decides to start with. Auto-bracketing can be truly automatic where one shutter press takes all the photos in sequence or, like my older digital camera, you have to press the shutter for each bracketed photo. To find out how your camera does auto-bracketing, check its manual (haven’t bugged you about reading that in awhile!).
