So taking pictures on bright day is difficult and often a photographer takes a picture and parts of it is either too bright or too dark. No matter what settings are used on the camera, nothing seems to help, despite the fact that your eyes were seeing everything just right. If you switched your camera to manual control, you could brighten up one area, which would darken another and vice-versa, but no settings would correctly expose both, all due to the large dynamic range of the scene.
HDR or High Dynamic Range Photography is a post-processing technique that uses multiple images of the same scene shot at different shutter speeds or apertures to combine them all into a single photograph. The result is an image with the most amount of detail in both shadow and bright areas of the image, close to what the human eye would see. Although it is better if you use multiple images of the same scene, you can also create an HDR image from a single image, as long as it is shot in RAW format. Hence, there are two methods of creating an HDR image:
- from a single RAW image and
- from multiple images.