Wikipedia defines High Dynamic Range as…
In image processing, computer graphics, and photography, high dynamic range imaging (HDRI or just HDR) is a set of techniques that allow a greater dynamic range of between the lightest and darkest areas of an image than current standard digital imaging techniques or photographic methods. This wide dynamic range allows HDR images to more accurately represent the range of intensity levels found in real scenes, ranging from direct sunlight to faint starlight, and is often captured by way of a plurality of differently exposed pictures of the same subject matter.[1][2][3]
The two main sources of HDR imagery are computer renderings and merging of multiple low-dynamic-range (LDR) [4] or standard-dynamic-range (SDR)[5] photographs. Tone-mapping techniques, which reduce overall contrast to facilitate display of HDR images on devices with lower dynamic range, can be applied to produce images with preserved or exaggerated local contrast for artistic effect.
Standard Photo
HDR Photo
Luckily for me, my iPod Touch can do HDR photography relatively easily.
Allen LaRose 