A photo is an image created by light falling on a light-sensitive surface, usually photographic film or an electronic image such as a CCD or DMOS chip. The first permanent photograph was made in 1822 by a French inventor, Joseph Nicephore Niepce, building on a discovery by Johann Heinrich Schults in 1724.
High dynamic range imaging (HDRI or HDR) is a set of methods used in imaging and photography, to allow a greater dynamic range between the lightest and darkest areas of an image than current standard digital imaging methods or photographic methods. HDR images can represent more accurately the range of intensity levels found in real scenes, from direct sunlight to faint starlight, and is often captured by way of a plurality of differently exposed pictures of the same subject matter. In simpler terms, HDR is a range of methods to provide higher dynamic range from the imaging process. Non-HDR cameras take pictures at one exposure level with a limited contrast range.
Contributions by Imroy, H, and Richie.