High Dynamic Range (HDR) is a technique of combining multiple images of one scene into one image. Images are taken with correct exposure, one or more underexposed and one or more images overexposed. HDR software (I used Photomatix 4.0.2) combines the images into one image. Software also allows for individual selection of image manipulation. It is best to use a tripod to capture the images. You must shoot in RAW mode. While on vacation in Sedona, AZ recently, I wondered how to capture images when I don’t have a tripod. I had my Canon 40 d camera with me. Using the “Auto Exposure Bracketing (AEB)” mode in the menu, I tried taking 3 images of the same scene using the highest speed continuous mode. It did not work like I expected .
Last week, before the SCV Chamber mixer, I took a series of photos at Bridgeport Marketplace using my EOS 1ds, Mark III after getting back from Canon for repair. Solution is to set the camera on the highest rapid fire setting possible, and set the camera to take images at under, right on and over exposures. On the Mark III I hold down the Mode and AF Drive buttons simultaneously and turning the wheel on the back of the camera to establish the 3 exposures which for this project I set at 1-1/3 over and 1-1/3under. Obviously the key is to hold the camera as steady as possible while taking the 3 images. I had some duds but was able to get 3 good sets of images to work with. I tried taking images in manual, aperature priority and shutter priority modes. There are drawbacks to each, especially when it comes to depth of field issues in Shutter priority mode since the camera is setting the aperature. In aperature priority you may have shutter speed issues if your ISO is not set high enough since the camera is choosing the shutterspeed.
HDR software brings out the best of each image. The overexposed image has shadow information not seen well in the properly exposed image. The underexposed image brings richness to the final image such as a darker sky, especially if you don’t have a polarizing filter or the filter does not work well in the situation you find yourself.
Attached are images I created. Hope you like.
Bob Messina
http://www.1stimage.com (to be redone soon)