We probably all know that HDR stands for High Dynamic Range. In all simplicity, this means images that cover the entire tonal range in a given scene. The photographer has been able to preserve the highlights and yet has enough shadow detail information. The photo avoids any clipped shadows or ‘black holes’ as I call them. The trouble with black holes is that they steal a lot of attention, and may draw the eyes to all the wrong places in an image. The same goes for severely clipped highlights. They are boring plain white, with hard transition lines.
There are three ways we can achieve a high dynamic range image. We will in the following briefly discuss each of them.